@article{ZNSL_1982_122_a6,
     author = {N. V. Ivanov},
     title = {An improvement of the {Hash--Tognoli} theorem},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {66--71},
     publisher = {mathdoc},
     volume = {122},
     year = {1982},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1982_122_a6/}
}