The interactive specification workspace: Specifying and designing the interaction issues of virtual reality training environments from within. - Costas N. Diplas; Achilles Kameas; Panayiotis E. Pintelas (DSV-IS, 1997)

Design of Interactivity in Virtual Reality Applications with Emphasis on Educational Software Using Formal Interaction Specification. - Costas N. Diplas; Panayiotis E. Pintelas (Educ. Inf. Technol., 2000)