@article{TMF_1995_105_3_a15,
     author = {N. N. Gorobey and A. S. Lukyanenko},
     title = {Operator representation of gravitational constraints for the case of the closed universe},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {503--507},
     publisher = {mathdoc},
     volume = {105},
     number = {3},
     year = {1995},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1995_105_3_a15/}
}