@article{MZM_1989_45_1_a4,
     author = {I. Ivanova-Karatopraklieva and I. Kh. Sabitov},
     title = {Second-order infinitesimal bendings of surfaces of rotation with densification at a pole},
     journal = {Matemati\v{c}eskie zametki},
     pages = {28--35},
     publisher = {mathdoc},
     volume = {45},
     number = {1},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1989_45_1_a4/}
}