@article{MZ_1991__207_2_174266,
     author = {Leonid Polterovich},
     title = {Monotome {Lagrange} submanifolds of linear spaces and the {Maslov} class in cotangent bundles.},
     journal = {Mathematische Zeitschrift},
     pages = {217--222},
     publisher = {mathdoc},
     volume = {207},
     number = {2},
     year = {1991},
     zbl = {0703.58018},
     url = {http://geodesic.mathdoc.fr/item/MZ_1991__207_2_174266/}
}