ⵜⵎⵙⵇⵙⴰ ⵖ ⵓⵙⴷⴷⵉ ⵓⵏⵜⵉⵎ ⵏ ⵓⵜⵉⵍⵉⴼⵉⵣⵢⵓⵏ ⵀⵓⵍⵉⵡⵓⴷ: ⴰ ⵙⵉⵍⵉⴱⵔⵉⵛⵏ ⵓⴼ ⴷⴰ ⴰⵎⵉⵔⵉⴽⴰⵏ ⵙⴰⵢⵍⵏⵜ ⴼⵉⵍⵎ (1980).