@article{ZNSL_1987_157_a1,
     author = {V. I. Vasyunin and M. T. Karaev},
     title = {She multiplicity of some contractions},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {23--29},
     publisher = {mathdoc},
     volume = {157},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1987_157_a1/}
}