@conference {,
	title = {Two systems which produce animated representations of the execution of computer programs},
	booktitle = {Proceedings of the fifth SIGCSE technical symposium on Computer science education  - SIGCSE {\textquoteright}75},
	year = {1975},
	note = {

},
	month = {1975},
	pages = {158 - 167},
	publisher = {ACM Press},
	organization = {ACM Press},
	doi = {http://doi.acm.org/10.1145/800284.811152},
	author = {Baecker, Ronald M.}
}