TY - JOUR AU - B. A. Rozenfel'd AU - M. A. Polovtseva AU - L. A. Ryazanova AU - T. I. Yukhtina TI - Segreans and quasi-Segreans and their application to the geometry of families of straight lines and planes JO - Izvestiâ vysših učebnyh zavedenij. Matematika PY - 1988 SP - 50 EP - 56 IS - 5 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/IVM_1988_5_a7/ LA - ru ID - IVM_1988_5_a7 ER -