@article{DAN_1989_308_3_a12,
     author = {G. L. Brovko},
     title = {The concepts of a process image and of five-dimensional isotropy},
     journal = {Doklady Akademii Nauk},
     pages = {565--570},
     publisher = {mathdoc},
     volume = {308},
     number = {3},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1989_308_3_a12/}
}