@article{IVM_1970_2_a4,
     author = {I. S. Kukles and L. B. Persidskaya},
     title = {Singular and quasisingular orders of curvature of integral curves in three-dimensional space},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {32--39},
     publisher = {mathdoc},
     number = {2},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1970_2_a4/}
}