TY - JOUR AU - A. F. Semenovich TI - Constructions by means of a straight edge with parallel edges in the Lobachevsky plane JO - Izvestiâ vysših učebnyh zavedenij. Matematika PY - 1963 SP - 149 EP - 152 IS - 3 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/IVM_1963_3_a20/ LA - ru ID - IVM_1963_3_a20 ER -