@article{TMF_1988_77_1_a5,
     author = {I. S. Vaklev and M. I. Ivanov},
     title = {Gauge transformation and generating operators for a~quadratic bundle},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {60--76},
     year = {1988},
     volume = {77},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1988_77_1_a5/}
}