TY - JOUR AU - B. ORBÁN TI - Extension of Collineations Defined on Certain Sets of a Desarguesian Projective Plane JO - Aequationes mathematicae PY - 1971 SP - 59 EP - 65 VL - 6 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/AM2_1971__6_136168/ ID - AM2_1971__6_136168 ER -