@article{IVM_1972_9_a11,
     author = {N. G. Perlova},
     title = {The prolongation of first order infinitesimal deformations of closed ribbed surfaces of revolution to second order infinitesimal deformations},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {84--89},
     publisher = {mathdoc},
     number = {9},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1972_9_a11/}
}