"unesco, . "
new treds in mathematics teaching: / unesco - 1 ed. - france : un 1979. - ", 280p.; 26 cm."
92-3-101546-x
--
510. .7 une
new treds in mathematics teaching: / unesco - 1 ed. - france : un 1979. - ", 280p.; 26 cm."
92-3-101546-x
--
510. .7 une