Geodesic
The quasiperiodic structure of level surfaces of a~Morse 1-form close to a~rational one~-- a~problem of S.\,P.~Novikov
Izvestiya. Mathematics , Tome 31 (1988) no. 3, pp. 635-655

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The topological structure is described of the level surfaces of a Morse 1-form which is close to a rational one on a closed oriented manifold. Applications are indicated to the investigation of the motion of an electron in a reciprocal lattice in a homogeneous magnetic field. Figures: 3. Bibliography: 11 titles. 
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     title = {The quasiperiodic structure of level surfaces of {a~Morse} 1-form close to a~rational one~-- a~problem of {S.\,P.~Novikov}},
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A. V. Zorich. The quasiperiodic structure of level surfaces of a~Morse 1-form close to a~rational one~-- a~problem of S.\,P.~Novikov. Izvestiya. Mathematics , Tome 31 (1988) no. 3, pp. 635-655. http://geodesic.mathdoc.fr/item/IM2_1988_31_3_a9/