TY - JOUR AU - B. V. Lazareva AU - A. M. Shelekhov TI - On the problem of classification of regular 4-webs formed by pencils of spheres JO - Izvestiâ vysših učebnyh zavedenij. Matematika PY - 2007 SP - 70 EP - 76 IS - 12 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/IVM_2007_12_a4/ LA - ru ID - IVM_2007_12_a4 ER -