The PELICAN System. - C. Chrioulis; Giannis Panagopoulou; Spiros Sirmakessis; Athanasios K. Tsakalidis; John Tzimas (DEXA Workshop, 1995)

The 'Cross' Rectangle Intersection Problem. - V. Kapelios; Giannis Panagopoulou; G. Papamichail; Spiros Sirmakessis; Athanasios K. Tsakalidis (Comput. J., 1995)

A Computer Based Solution for Blood Transfusion Centres: The Case Study of Greece. - Giannis Panagopoulou; Spiros Sirmakessis; Athanasios K. Tsakalidis; Giannis Tzimas (CBMS, 1997)