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<top_article>
 <mrnumber>MR1065466</mrnumber>
 <author>Villari, Gabriele and Zanolin, Fabio</author>
 <author_utf8>Gabriele VILLARI and Fabio ZANOLIN</author_utf8>
 <title>On a dynamical system in the Li&#233;nard plane. Necessary               and sufficient conditions for the intersection with the               vertical isocline and applications</title>
 <journal>Funkcialaj Ekvacioj. Serio Internacia</journal>
 <volume>33</volume>
 <year>1990</year>
 <page>19--38</page>
 <url_pdf>http://fe.math.kobe-u.ac.jp/FE/Free/vol33/fe33-1-2.pdf</url_pdf>
 <url_infty_pdf>http://fe.math.kobe-u.ac.jp/FE/FE_pdf_with_bookmark/FE31-34-en_KML/fe33-019-038/fe33-019-038.pdf</url_infty_pdf>
 <mathsci_link> http://www.ams.org/mathscinet-getitem?mr=MR1065466</mathsci_link>
<fesi_info>
  <FILE>fe33-019-038</FILE>
  <YEAR>1990</YEAR>
  <TITLE>On a Dynamical System in the Lienard Plane. Necessary and Sufficient Conditions for the Intersection with the Vertical Isocline and Applications</TITLE>
  <AUTHOR>VILLARI, Gabriele; ZANOLIN, Fabio</AUTHOR>
  <AUTHOR_utf8>VILLARI, Gabriele; ZANOLIN, Fabio</AUTHOR_utf8>
</fesi_info>

<references>
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    <title>Periodic solutions for Li&#233;nard systems</title>
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  </article>

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    <page>viii+271</page>
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    <author>Cesari, L.; Kannan, R.</author>
    <title>Periodic solutions in the large of Li&#233;nard systems with forcing terms</title>
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  </article>

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    <title>On the generalized Li&#233;nard equation with negative damping</title>
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  <book>
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    <score>100</score>
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    <page>xvi+332</page>
  </book>

  <fearticle>
    <bibitem>10</bibitem>
    <author>Hara, T.; Yoneyama, T.</author>
    <title>On the global center of generalized Li&#233;nard equation and its application to stability problems</title>
    <journal>Funkcial. Ekvac.</journal>
    <vol>28</vol>
    <year>1985</year>
    <page>171-192</page>
    <mr>MR0816825</mr>
<feart>0816825</feart>
    <score>100</score>
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  </fearticle>

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  </article>

  <article>
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    <author>Mawhin, J.</author>
    <title>An extension of a theorem of A. C. Lazer on forced nonlinear oscillations</title>
    <journal>J. Math. Anal. Appl.</journal>
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    <year>1972</year>
    <page>20-29</page>
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    <score>100</score>
    <query_string>Cache/Ma/Mawhin,oscillations,J*,1972,1973</query_string>
  </article>

  <article>
    <bibitem>13</bibitem>
    <author>Omari, P.; Villari, Gab.; Zanolin, F.</author>
    <title>Periodic solutions of the Li&#233;nard equation with one-sided growth restrictions</title>
<journal>J. Differential Equations</journal>
    <vol>67</vol>
    <year>1987</year>
    <page>278-293</page>
    <mr>MR0879698</mr>
    <query_string>cgiQueryMR.fname is not set</query_string>
  </article>

  <article>
    <bibitem>14</bibitem>
    <author>Omari, P.; Villari, Gab.; Zanolin, F.</author>
    <title>A survey of recent applications of fixed point theory to periodic solutions of the Li&#233;nard equation</title>
    <journal>in Fixed point theory and its appications (R. F. Brown, ed.), Contemporary Math., vol. 72, Amer. Math. Soc., Providence R. I</journal>
    <year>1988</year>
    <page>171-178</page>
    <mr>MR0956489</mr>
  </article>

  <article>
    <bibitem>15</bibitem>
    <author>Opial, Z.</author>
    <title>Sur un th&#232;oreme de A. Filippov</title>
    <journal>Ann. Polon. Math.</journal>
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    <page>67-75</page>
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  </article>

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    <bibitem>16</bibitem>
    <author>Ponzo, P. J.; Wax, N.</author>
    <title>On periodic solutions of the system  $x=y-F(x)$, $y=-g(x)$</title>
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    <year>1971</year>
    <page>262-269</page>
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  </article>

  <article>
    <bibitem>17</bibitem>
    <author>Reissig, R.</author>
    <title>Extension of some results concerning the generalized Li&#233;nard equation</title>
    <journal>Ann. Mat. Pura Appl. (4)</journal>
    <ser>(4)</ser>
    <vol>104</vol>
    <year>1975</year>
    <page>269-281</page>
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  <book>
    <bibitem>18</bibitem>
    <author>Reissig, R.; Sansone, G.; Conti, R.</author>
    <booktitle>Qualitative Theorie nichtlinearer Differentialgleichungen</booktitle>
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    <year>1963</year>
    <mr>MR0158121</mr>
    <query_string>Cache/Re/Reissig,Differentialglei-,*,1963,1964</query_string>
  </book>

  <book>
    <bibitem>19</bibitem>
    <author>Sansone, G.; Conti, R.</author>
    <booktitle>Non-linear differential equations</booktitle>
    <publisher>Pergamon Press</publisher>
    <year>1964</year>
    <mr>MR0177153</mr>
    <score>100</score>
    <query_string>Cache/Sa/Sansone,Non-linear,*,1964,1965</query_string>
    <page>xiii+536</page>
  </book>

  <article>
    <bibitem>20</bibitem>
    <author>Villari, Gab</author>
    <title>Periodic solutions of Li&#233;nard's equation</title>
    <journal>J. Math. Anal. Appl.</journal>
    <vol>86</vol>
    <year>1982</year>
    <page>379-386</page>
    <mr>MR0652183</mr>
    <score>100</score>
    <query_string>Cache/Vi/Villari,solutions,J*,1982,1983</query_string>
  </article>

  <article>
    <bibitem>21</bibitem>
    <author>Villari, Gab</author>
    <title>On the existence of periodic solutions for Li&#233;nard's equation</title>
    <journal>Nonlinear Anal.</journal>
    <vol>7</vol>
    <year>1983</year>
    <page>71-78</page>
    <mr>MR0687031</mr>
    <score>100</score>
    <query_string>Cache/Vi/Villari,existence,Nonlinear*,1983,1984</query_string>
  </article>

  <article>
    <bibitem>22</bibitem>
    <author>Villari, Gab</author>
    <title>On the qualitative behaviour of solutions of Li&#233;nard equation</title>
    <journal>J. Differential Equations</journal>
    <vol>67</vol>
    <year>1987</year>
    <page>269-277</page>
    <mr>MR0879697</mr>
    <score>100</score>
    <query_string>Cache/Vi/Villari,qualitative,J*,1987,1988</query_string>
  </article>

  <article>
    <bibitem>23</bibitem>
    <author>Villari, Gab.; Zanolin, F.</author>
    <title>Some remarks on nonconservative oscillatory systems with periodic solutions</title>
    <journal>Int. J. Nonlinear Mech.</journal>
    <vol>23</vol>
    <year>1988</year>
    <page>1-7</page>
    <mr>MR0931681</mr>
    <query_string>Cache/Vi/Villari,non-conservative,Int*,1988,1989</query_string>
  </article>

  <fearticle>
    <bibitem>24</bibitem>
    <author>Villari, Gab; Zanolin, F.</author>
    <title>On forced nonlinear oscillations of a second order equation with strong restoring term</title>
    <journal>Funkcial. Ekvac.</journal>
    <vol>31</vol>
    <year>1988</year>
    <page>383-395</page>
    <mr>MR0987793</mr>
<feart>0987793</feart>
    <score>100</score>
    <query_string>Cache/Vi/Villari,oscillations,Funkcial*,1988,1989</query_string>
  </fearticle>

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    <title>Existence of limit cycles of nonlinear oscillating differential equations</title>
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    <year>1956</year>
    <page>33-46 (Chinese)</page>
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  </article>

  <book>
    <bibitem>26</bibitem>
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    <booktitle>Theory of Limit Cycles</booktitle>
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    <booktitle>Qualitative Theory of Ordinary Differential Equations</booktitle>
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  </book>

</references>
</top_article>
