Computing and Handling Cardinal Direction Information. - Spiros Skiadopoulos; Christos Giannoukos; Panos Vassiliadis; Timos K. Sellis; Manolis Koubarakis (EDBT, 2004)

Computing and Managing Cardinal Direction Relations. - Spiros Skiadopoulos; Christos Giannoukos; Nikos Sarkas; Panos Vassiliadis; Timos K. Sellis; Manolis Koubarakis (IEEE Trans. Knowl. Data Eng., 2005)