@book{21058,
	author = {Lester, Frank K. and Spencer Foundation.},
	title = {Mathematical problem solving},
	publisher = {Franklin Institute Press},
	year = {c1982.},
	address = {Philadelphia, Pa.},
	note = {Revisions of papers prepared for a conference held at Indiana University in May 1981, sponsored by the Spencer Foundation and the Indiana University School of Education.}
}