MR0306609
Chow, S. N. and Dunninger, D. R. and Schuur, J. D.
S. N. CHOW, D. R. DUNNINGER and J. D. SCHUUR
Oscillatory properties of solutions of {$n$}-th order ordinary differential equations
Funkcialaj Ekvacioj. Serio Internacia
14
1971
191--196
http://fe.math.kobe-u.ac.jp/FE/Free/vol14/fe14-17.pdf
http://fe.math.kobe-u.ac.jp/FE/FE_pdf_with_bookmark/FE11-20-en_KML/fe14-191-196/fe14-191-196.pdf
http://www.ams.org/mathscinet-getitem?mr=MR0306609
fe14-191-196
1971
Oscillatory Properties of Solutions of $n$-th Order Ordinary Differential Equations
CHOW, S. N.; DUNNINGER, D. R.; SCHUUR, J. D.
CHOW, S. N.; DUNNINGER, D. R.; SCHUUR, J. D.
1
Leighton, W.; Nehari, Z.
On the oscillation of solutions of self-adjoint linear differential equations of the fourth order
Trans. Amer. Math. Soc.
89
1958
325-377
MR0102639
100
Cache/Le/Leighton,self-adjoint,Trans*,1958,1959
2
Diaz, J. B.; Dunninger, D. R., Sturm separation and comparison theorems for a class of fourth order ordinary and partial differential equations, (to appear in Applicable Analysis)
MR0397122