Voir la notice de l'article provenant de la source Math-Net.Ru
@misc{KVANT_2015_5_a25, title = {{\CYRP}{\cyre}{\cyrr}{\cyrp}{\cyre}{\cyrn}{\cyrd}{\cyri}{\cyrk}{\cyru}{\cyrl}{\cyrya}{\cyrr}{\cyrery} {\cyri} {\cyre}{\cyrshch}{\cyre} {\cyro}{\cyrd}{\cyri}{\cyrn} {\cyrp}{\cyrr}{\cyri}{\cyrz}{\cyrn}{\cyra}{\cyrk} {\cyrv}{\cyrp}{\cyri}{\cyrs}{\cyra}{\cyrn}{\cyrn}{\cyro}{\cyrg}{\cyro} {\cyrch}{\cyre}{\cyrt}{\cyrery}{\cyrr}{\cyre}{\cyrh}{\cyru}{\cyrg}{\cyro}{\cyrl}{\cyrsftsn}{\cyrn}{\cyri}{\cyrk}{\cyra}}, journal = {Kvant}, pages = {83}, publisher = {mathdoc}, number = {5}, year = {2015}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/KVANT_2015_5_a25/} }
Перпендикуляры и еще один признак вписанного четырехугольника. Kvant, no. 5 (2015). http://geodesic.mathdoc.fr/item/KVANT_2015_5_a25/