@article{ZNSL_1985_143_a5,
     author = {V. G. Turaev},
     title = {First symplectic {Chern} class and {Maslov} indices},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {110--129},
     publisher = {mathdoc},
     volume = {143},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1985_143_a5/}
}