Regularities in the Formation and Evolution of Information Cities. - Stelios Lelis; Petros Kavassalis; Jakka Sairamesh; Seif Haridi; Fredrik Holmgren; Mahmoud Rafea; Antonis Hatzistamatiou (Digital Cities, 2001)

What makes a Web site popular? - Petros Kavassalis; Stelios Lelis; Mahmoud Rafea; Seif Haridi (Commun. ACM, 2004)

Informing decisions: how people use online rating information to make choices. - Stelios Lelis; Andrew Howes 001 (CHI, 2011)