@conference {137236,
	title = {Differences in fidelity of implementation measures: What videos and surveys reveal about algebra instruction},
	booktitle = {Annual meeting of the Society for Research on Educational Effectiveness Spring 2013 Conference},
	year = {2012},
	note = {Request a copy of this paper},
	address = {Washington, DC},
	author = {Durkin, K. and Pollack, C. and Star, J. R. and Rittle-Johnson, B.}
}
