Ḥalqah al-Dirāsīyah lil-Buḥūth fī al-Qānūn (4th 1972 Khartoum, Sudan)

• al- Ḥalqah al-Dirāsīyah al-Rābiʻah lil-Buḥūth fī al-Qānūn, al-Khart̄ūm, min 5-10 Mārs 1972