Loney, S.L..
The Elements of Coordinate Geometry / - Reprinted 1963 / - London WC 2 : Macmillan and Company Ltd.. - p.228,viii :
Mathematics
B6:23 / K2.2;1
The Elements of Coordinate Geometry / - Reprinted 1963 / - London WC 2 : Macmillan and Company Ltd.. - p.228,viii :
Mathematics
B6:23 / K2.2;1