University of Wisconsin, Madison, U.S.A. – 1986
University of Reading, Reading, U.K. – 1977 – 1978
Ahmadu Bello University, Zaria – 1972 – 1975
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University of Wisconsin, Madison, U.S.A. – 1986
University of Reading, Reading, U.K. – 1977 – 1978
Ahmadu Bello University, Zaria – 1972 – 1975
