@article{DAN_1987_292_1_a0,
     author = {S. K. Vodopyanov},
     title = {Isoperimetric relations and conditions for the extension of},
     journal = {Doklady Akademii Nauk},
     pages = {11--15},
     publisher = {mathdoc},
     volume = {292},
     number = {1},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1987_292_1_a0/}
}