Obaid, Alaa Abdulzahra
Obeidat, Sofian, University of Hail
Ochilov, Narzillo
Odey, J.A.
Ofoedu, E.U., Nnamdi Azikiwe University Awka
Ofoedu, Eric Uwadiegwu
Ogbu, I. F., Covenant University
Oghonyon, J. G.
Oghonyon, J. G., Covenant University, Ota, Ogun State, Nigeria (Nigeria)
Oghonyon, Jiemvwo Godwin, Covenant University
Ogunniyi, P. O., Covenant University
Oguntunde, Pelumi E.
Oh, Miew Leng
Ojah, Salwan Kadhim
Okoro, Ogbonnaya I.
Okunlola, J.T.
Okunlola, J.T.
Olaleru, J.O.
Olaniyi, Samson
Olanrewaju, Faweya
Olisama, V.O., University of Lagos, Nigeria.
Oliveira, E. Capelas de, Unicamp
Olteanu, Octav
Olteanu, Octav, "University Politehnica of Bucharest" (Romania)
Olufunmilola, Olubiyi Adenike

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