books.google.co.uk - This monograph develops projective geometries and provides a systematic treatment of morphisms. It is unique in that it does not confine itself to isomorphisms. This work introduces a new fundamental theorem and its applications describing morphisms of projective geometries in homogeneous coordinates...http://books.google.co.uk/books/about/Modern_Projective_Geometry.html?id=xSdHoHGn-YMC&utm_source=gb-gplus-shareModern Projective Geometry
