@book{7371,
	author = {Yang, Wei-Chi. and Lewin, Jonathan.},
	title = {Exploring mathematics with scientific notebook /},
	publisher = {Springer,},
	year = {1998.},
	address = {[S.l.] :},
	edition = {1st ed.},
	url = {http://www.amazon.com/exec/obidos/ASIN/9813083883/chopaconline-20}
}