by Akpen, G.D., Aho, M.I., Adejo, M.G.
Published in Nigerian journal of technology (16.01.2019)

by Akpen, G.D., Aho, M.I., Mamwan, M.H.
Published in Global journal of pure and applied sciences (25.07.2018)

by Akpen, G.D., Kpoghol, I.S., Oparaku, L.A.
Published in Nigerian journal of technology (17.01.2018)

by Akpen, G.D., Aho, M.I., Musa, A.A.
Published in Global journal of pure and applied sciences (29.04.2019)

by Akpen, G.D, Aondoakaa, S.C
Published in Global journal of environmental sciences (16.04.2010)