Northop, Eugene P.
Riddles in mathematics : a book of paradoxes / by Eugene P. Northop - Harmonsworth : Penguin Books, 1975. - 240 p. : ill. ;
Mathematics.
Riddles in mathematics : a book of paradoxes / by Eugene P. Northop - Harmonsworth : Penguin Books, 1975. - 240 p. : ill. ;
Mathematics.