@article{ZNSL_1991_193_a6,
     author = {V. M. Nezhinskiy},
     title = {A {Homotopy} theory to classify singular links},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {101--118},
     publisher = {mathdoc},
     volume = {193},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1991_193_a6/}
}