@proceedings {5728,
	title = {Teacher knowledge and the implementation of  investigation tasks},
	journal = { Proceedings  of the 37th Conference of the International Group for the Psychology  of Mathematics Education},
	year = {2013},
	pages = {258},
	publisher = {PME},
	address = {Kiel, Germany},
	url = {http://www.pme2013.de/en/contributions/print-on-demand-proceedings},
	author = {Rocha, H.}
}
