@article{TMF_1977_33_1_a0,
     author = {I. V. Volovich and V. A. Zagrebnov and V. P. Frolov},
     title = {On the definition of the vacuum in the {Gravitational} field; the $\Re$ vacuum},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {3--16},
     publisher = {mathdoc},
     volume = {33},
     number = {1},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1977_33_1_a0/}
}