@article{TMF_1989_79_2_a2,
     author = {Ya. I. Kogan and D. G. Markushevich and A. Yu. Morozov and M. A. Olshanetsky and A. M. Perelomov and A. A. Roslyi},
     title = {Some examples of~instantons in~sigma models},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {185--197},
     publisher = {mathdoc},
     volume = {79},
     number = {2},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1989_79_2_a2/}
}