@article{TMF_1999_121_2_a5,
     author = {O. V. Man'ko},
     title = {Classical propagators of quadratic quantum systems},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {285--296},
     publisher = {mathdoc},
     volume = {121},
     number = {2},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1999_121_2_a5/}
}