@article{DAN_1970_195_2_a16,
     author = {N. V. Mitskevich and V. N. Zakharov},
     title = {Transformation properties for general covariant observables},
     journal = {Doklady Akademii Nauk},
     pages = {321--324},
     publisher = {mathdoc},
     volume = {195},
     number = {2},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1970_195_2_a16/}
}