@article{INTO_2002_11_a0,
     author = {\`E. G. Poznyak and A. G. Popov},
     title = {Non-Euclidean geometry: {The} {Gauss} formula and an interpretation of partial differential equations},
     journal = {Itogi nauki i tehniki. Sovremenna\^a matematika i e\"e prilo\v{z}eni\^a. Temati\v{c}eskie obzory},
     pages = {5--23},
     publisher = {mathdoc},
     volume = {11},
     year = {2002},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/INTO_2002_11_a0/}
}