@article{FPM_2010_16_2_a5,
     author = {N. G. Konovenko},
     title = {On local classification of geometrical quantities on the {Lobachevski} plane},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {55--59},
     publisher = {mathdoc},
     volume = {16},
     number = {2},
     year = {2010},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_2010_16_2_a5/}
}