@article{IVM_1988_12_a2,
     author = {V. M. Deundyak and I. B. Simonenko and Chin' Ngok Min'},
     title = {Symbols and a~homotopy classification of families of one-dimensional singular operators with piecewise-continuous coefficients},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {17--27},
     publisher = {mathdoc},
     number = {12},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1988_12_a2/}
}