Perspectives on the teaching of geometry for the 21st century

MAMMANA, Carmelo - VILLANI, Vinicio. Perspectives on the teaching of geometry for the 21st century : an ICMI study. Dordrecht : Kluwer Academic Publishers, c1998 ; Boston ; London. 353 s. New ICMI Studies Series ; Volume 5. ISBN 0-7923-4991-1.