@article{FPM_2005_11_1_a10,
     author = {A. G. Popov},
     title = {Pseudospherical surfaces and some problems of mathematical physics},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {227--239},
     publisher = {mathdoc},
     volume = {11},
     number = {1},
     year = {2005},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_2005_11_1_a10/}
}