@book{Zain1981, author="Mohamed Gaffar Zain", title="The brain drain in the context of social change to Democratic Yemen and problems in high level manpower training at Aden University", year="1981", booktitle="The Arab Brain Drain (Proceedings of a seminar organised by the Natural Resources, Science and Technology Division of the United Nations Economic Commission for West Asia. Beirut 4-8 February 1980)", editor="A.B. Zahlan", publisher="Ithaca Press", address="London", pages="43-58", keyword0="Migration", keyword1="PDRY", type="chapter" }