Smogorzhevshkii, A.S..
The Ruler in Geometrical Constructions / - 1st ed / - London W.1 : Pergamon Press Ltd.. - p.86 :
Mathematics
B6:4 / K1
The Ruler in Geometrical Constructions / - 1st ed / - London W.1 : Pergamon Press Ltd.. - p.86 :
Mathematics
B6:4 / K1