@article{purchase_comprehension_2004,
	title = {Comprehension of diagram syntax: an empirical study of entity relationship notations},
	volume = {61},
	number = {2},
	journal = {International Journal of Human-Computer Studies},
	author = {Purchase, H. C. and Wellanda, R. and McGillb, M. and Colpoysb, L.},
	year = {2004},
	pages = {187--203},
}

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