@article{ZNSL_1991_196_a12,
     author = {V. A. Shlik},
     title = {The condition of $\varepsilon$-clasping for $N$-compacts},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {154--161},
     year = {1991},
     volume = {196},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1991_196_a12/}
}