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[1] ALEXANDROV P. S.: Combinatorial Topology. (in Russian), Gostechizdat, Moscow - Leningrad, 1949.
[2] HÁJEK O.: Sections of dynamical systems in $E^2$. to appear in Czech. Math. Journ. MR 0176181
[3] NIEMYCKIĬ V. V., STĚPANOV V. V.: Qualitative theory of differential equations. (in Russian), 2nd ed., Gostechizdat, Moscow - Leningrad, 195.
[4] STIEFEL E.: Richtungsfelder und Fernparallelismus in n-dimensionalen Mannigfaltigkeiten. Comment. Math. Helv., 8 (1936), 3-51. Zbl 0014.41601
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