@article{IVM_1977_12_a5,
     author = {V. S. Kim},
     title = {The differential geometry of smooth nonregular surfaces},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {29--38},
     year = {1977},
     number = {12},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1977_12_a5/}
}