Edwin Ogechukwu Omeje, Patience Ogoamaka Osadebe, Chukwuemeka Sylvester Nworu, Justina Ngozi Nwodo, Wilfred Ofem Obonga, Akira Kawamura, Charles Okechukwu Esimone and Peter Proksch
Pharmaceutical Biology 49 ( 12 ): 1271 - 1276 , 2011