PHASE: An interactive appraisal package for whole hospital design. - D. Kernohan; G. D. Rankin; G. D. Wallace; Robert J. Walters (Comput. Aided Des., 1973)

Experimental Comparison of the Comprehensibility of a UML-based Formal Specification versus a Textual One. - Rozilawati Razali; Colin F. Snook; Michael Poppleton; Paul W. Garratt; Robert J. Walters (EASE, 2007)