@article{IM2_1988_31_3_a9,
     author = {A. V. Zorich},
     title = {The quasiperiodic structure of level surfaces of {a~Morse} 1-form close to a~rational one~-- a~problem of {S.\,P.~Novikov}},
     journal = {Izvestiya. Mathematics },
     pages = {635--655},
     publisher = {mathdoc},
     volume = {31},
     number = {3},
     year = {1988},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1988_31_3_a9/}
}