Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{TGS_1991__21_72443, author = {{\CYRA}.{\CYRP}. {\CYRSH}{\cyri}{\cyrr}{\cyro}{\cyrk}{\cyro}{\cyrv}}, title = {{\CYRK} {\cyrg}{\cyre}{\cyro}{\cyrm}{\cyre}{\cyrt}{\cyrr}{\cyri}{\cyri} {\cyro}{\cyrr}{\cyri}{\cyrs}{\cyrf}{\cyre}{\cyrr} {\cyrp}{\cyrr}{\cyro}{\cyrs}{\cyrt}{\cyrr}{\cyra}{\cyrn}{\cyrs}{\cyrt}{\cyrv}{\cyra} {{\CYRL}{\cyro}{\cyrb}{\cyra}{\cyrch}{\cyre}{\cyrv}{\cyrs}{\cyrk}{\cyro}{\cyrg}{\cyro}}}, journal = {Trudy geometri\v{c}eskogo seminara}, pages = {118--124}, publisher = {mathdoc}, volume = {21}, year = {1991}, zbl = {0928.53004}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/TGS_1991__21_72443/} }
А.П. Широков. К геометрии орисфер пространства Лобачевского. Trudy geometričeskogo seminara, Tome 21 (1991), pp. 118-124. http://geodesic.mathdoc.fr/item/TGS_1991__21_72443/