@article{AA_1997_9_2_a1,
     author = {N. M. Ivochkina and O. A. Ladyzhenskaya},
     title = {Estimation of the second derivatives on the boundary for surfaces evolving under the action of their principal curvatures},
     journal = {Algebra i analiz},
     pages = {30--50},
     publisher = {mathdoc},
     volume = {9},
     number = {2},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_1997_9_2_a1/}
}