@book{87242,
	author = {Brown, Stephen I. and Walter, Marion I.,},
	title = {The art of problem posing /},
	publisher = {Lawrence Erlbaum,},
	year = {2005.},
	address = {Mahwah, N.J. :},
	edition = {3rd ed.},
	url = {http://www.loc.gov/catdir/enhancements/fy0634/2004049703-d.html}
}