@article{DAN_1977_236_5_a14,
     author = {K. I. Volyak},
     title = {Variational principle for a compressible fluid},
     journal = {Doklady Akademii Nauk},
     pages = {1095--1097},
     year = {1977},
     volume = {236},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1977_236_5_a14/}
}