@article{DE_1987_23_11_a16,
     author = {G. A. Seregin},
     title = {On the differentiability of extremals of variational problems of the mechanics of ideally elastoplastic media},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1981--1991},
     publisher = {mathdoc},
     volume = {23},
     number = {11},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1987_23_11_a16/}
}