Open system for the development of software manuals. - Hristo Tujarov; Ivelin Mihailov (CompSysTech, 2003)

Scheme of modeling and lifecycle in the development of Information Systems in Publishing Activity (ISPA). - Ivelin Mihailov (CompSysTech, 2004)

PER model: semantic data models developing. - Hristo Tujarov; Ivelin Mihailov (CompSysTech, 2004)