Entrainment domains

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17 Mitropolski, Y. A. On the investigation of an integral manifold for a system of nonlinear equations with variable coefficients Ukrain. Mat. Ž. 10 1958 270-279 (Russian) MR0101364 Cache/Mi/Mitropolski,investigation,Ukrain*,1958,1959

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19 Pugh, C. C. An improved closing lemma and a general density theorem Amer. J. Math. 89 1967 1010-1021 MR0226670 100 Cache/Pu/Pugh,improved,Amer*,1967,1968

20 Sotomayor, J. Generic one parameter families of vector fields in two dimensional manifolds Bull. Amer. Math. Soc. 74 1968 722-726 MR0231412 77 Cache/So/Sotomayor,dimensional,Bull*,1968,1969