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1- H. A. S. Abujabal and M. A. Obaid, Some commutativity theorems for right s-unital rings. Math. Japonica, 37 ( 1992 ), 1-11. ( Japan ) .
2- H. S. Abujabal, M. Ashraf and M. A. Obaid, Commutativily of rings with certain constraints , Math. Japonica, 37 ( 1992 ), 965-972. (Japan ) .
3- H.A S . Abujabal . M . A . OBAID . M Aslam and A. B . TAHEEM , On annahilators of BCK – algebras , Czechoslovak Math. J , 45 ( 120 ) ( 1995 ), 727-735 ( Czechoslovakia) .
4- H. A. S. Abujabal, M. A. Obaid and S. M. A. Zaidi, Projective structures in categories > Bulletin of Pure and Applied Sciences, Vol. 15 E ( No.2 ), ( 1992 ). 207-215. ( India ) .
5- H. A. S. Abujabal, M. A. Obaid and S. M. A. Zaidi, Creations of some structures in categories, Proyecciones Rov . Mat., 14, No. 2 ( 1995), 105-113. ( ( Chile ).
6- H. A. S. Abujabal, M. A. Obaid A radical approach in BCI-algebras. Southeast Asian Bull. Math., ( accepted Jan, 1, 1997). ( Hong Kong ).
7- M. A. Obaid, Some commutativity properties for rings, Far East J. Math. Sci,. Vol. 5 ( 1997 ), No. 2, June issue, PP. 291-296., ( India ) .
8- M. A. Obaid, On structure and commutativity of near rings, Bulletin of Pure and Applied Sciences, ( 1997 ), ( India ) .
9- H. A. S. Abujabal, M. A. Obaid , S. M. A. Zaidi and S. Khan, A categorical study of p-semisimple BCI-algebras, J. Qufu Normal Univ., 23, No. 1, ( 1997 ), 21-28 ( China ) .
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