Bell, Robert J.T..
Coordinate Solid Geometry / - 1st ed / - London WC2 : Macmillan & Co. Ltd.. - p.175,xliii :
Mathematics
B63:23 / K4;1
Coordinate Solid Geometry / - 1st ed / - London WC2 : Macmillan & Co. Ltd.. - p.175,xliii :
Mathematics
B63:23 / K4;1