Encyclopedia universalis (Encyclopaedia, corpus 18, Paris, 1988)4 deg-s yedda-d usegzi n wawal tansayit ɣef waṭas n lemɛani ad d-nefren tlata gar-asen :  Tansayit d taggayt n usiweḍ n tɣawsiwin i wiyaḍ.