@article{DAN_1976_230_3_a18,
     author = {W. I. Fushchych},
     title = {On the complementary invariance of {Klein--Gordon--Fock} equation},
     journal = {Doklady Akademii Nauk},
     pages = {570--572},
     publisher = {mathdoc},
     volume = {230},
     number = {3},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1976_230_3_a18/}
}