@article{IVM_1971_11_a3,
     author = {A. M. Vainberg},
     title = {The hyperarea of the level surfaces of functions of several variables},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {25--27},
     publisher = {mathdoc},
     number = {11},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1971_11_a3/}
}