@BOOK {THOTTAPILLY:1996, title = {Virus diseases of cowpea in Africa: IITA Research Guide, No. 53}, author = {Thottappilly, G. and Rossel, H. W. }, series = {IITA Research Guide, No. 53}, year = {1996}, month = {December}, publisher = {International Institute of Tropical Agriculture (IITA)}, address = {Ibadan, Nigeria}, note = {28p.}, }