@article{SM_1975_26_2_a0,
     author = {L. L. Beskorovainaya},
     title = {Canonical $A$-deformations preserving the lengths of lines of curvature on a~surface},
     journal = {Sbornik. Mathematics},
     pages = {151--164},
     publisher = {mathdoc},
     volume = {26},
     number = {2},
     year = {1975},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1975_26_2_a0/}
}