UML Class Diagram Syntax: An Empirical Study of Comprehension. - Helen C. Purchase; Linda Colpoys; Matthew McGill; David A. Carrington; Carol Britton (InVis.au, 2001)

Graph Drawing Aesthetics and the Comprehension of UML Class Diagrams: An Empirical Study. - Helen C. Purchase; Matthew McGill; Linda Colpoys; David A. Carrington (InVis.au, 2001)

UML Collaboration Diagram Syntax: An Empirical Study of Comprehension. - Helen C. Purchase; Linda Colpoys; Matthew McGill; David A. Carrington (VISSOFT, 2002)

Cognitive measurements of graph aesthetics. - Colin Ware; Helen C. Purchase; Linda Colpoys; Matthew McGill (Inf. Vis., 2002)

Comprehension of diagram syntax: an empirical study of entity relationship notations. - Helen C. Purchase; Ray Welland; Matthew McGill; Linda Colpoys (Int. J. Hum. Comput. Stud., 2004)