1. N.M Pearsall, C. Goodbody, O.U. Oparaku, A.A Dollery, R. Hill, Effect of Isotropic proton irradiation on the performance of ITO/InP Solar Cells.Proc. Of the 20th IEEE PV Conf. P. 898-902, Las Vegas, U.S.A, (1988).
2. O.U. Oparaku, The Role of Photovoltaics in the new information age. The Developing Countries Perspective. Proc. of the Int. Conf. on “Developing Countries and the New Information Age” Nsukka, Nigeria, P. 176 - 182 (1989)
3. O.U.Oparaku, N.M. Pearsall, R. Hill. Potential of ITO/InP Solar Cells for Space Applications. Nig. J.of Solar Energy, Vol.8, p. 243-249 (1989)
4. O.U. Oparaku, C.L Dargan, N.M. Pearsall, R. Hill (1990) Characterization of Zn/Au back contacts to low-doped P-InP. J. Semiconductor Sci. & Tech. P.65-69 (1990)
5. O.U. Oparaku, N.M Pearsall, R.Hill, Terrestrial stability of ITO/InP Solar Cells. Nigerian J. Solar Energy, Vol. 9, p 78-84 (1990)
6. O.U. Oparaku, O.C. Iloeje. Design considerations for a PV water pumping facility for a rural village near Nsukka, Nigeria Nig. J. of Solar Energy, Vol. 10,p. 64 -9 (1990)
7. O.C. Iloeje, D.C. Onyejekwe, O.U. Oparaku, S.O.Enibe, C. Nwanunobi, N. Okubuike, J.Ogbudimkpa: National Energy Survey Report: Submitted to the Energy Commission of Nigeria, Lagos (1991)
8. O.U. Oparaku, Electrical Energy for Rural Development- The PV Solar Energy Option Nig. J. of Solar Energy, Vol. 12, p. 93-102 (1993)
9. O.U. Oparaku Towards a National Photovoltaics Program. Nig. J. of Solar Energy, Vol. 12.p. 66-73 (1993)
10. T.C. Madueme, I.N. Iwuagwu, O.U. Oparaku. Nigeria and Renewable Energy Resources: The Journey So Far: Proceedings of the International Workshop on Power Systems Operation and Planning, Lagos, Nigeria. P. 224 - 7 (Jan. 1995).