@article{TM_1998_221_a17,
     author = {P. E. Pushkar'},
     title = {Generalization of the {Chekanov} {Theorem.} {Diameters} of {Immersed} {Manifolds} and {Wave} {Fronts}},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {289--304},
     publisher = {mathdoc},
     volume = {221},
     year = {1998},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1998_221_a17/}
}