TY  - JOUR
AU  - L. N. Romakina
TI  - Hyperbolic parallelograms of the plane~$\widehat H$
JO  - Izvestiya of Saratov University. Mathematics. Mechanics. Informatics
PY  - 2013
SP  - 43
EP  - 52
VL  - 13
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/ISU_2013_13_3_a5/
LA  - ru
ID  - ISU_2013_13_3_a5
ER  -