International Symposium on Languages and History of the Nilotic Peoples (1982 Cologne, Germany)
Roger Carmichael Robert Owen
Nilo-Saharan Linguistics Colloquium (9th 2004 Jāmiʻat al-Kharṭūm. Maʻhad al-Dirāsāt al-Afrīqīyah wa-al-Āsiyawīyah)
L. M. Spagnolo
Bernd Heine
Dimmendaal
