OrienTel - Telephony Databases Across Northern Africa and the Middle East. - Dorota J. Iskra; Rainer Siemund; Jamal Borno; Asunción Moreno; Ossama Emam; Khalid Choukri; Oren Gedge; Herbert S. Tropf; Albino Nogueiras; Imed Zitouni; Anastasios Tsopanoglou; Nikos Fakotakis (LREC, 2004)