?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.aufirst=P+G+A&rft.au=Omanga%2C+P+G+A&rft.aulast=Omanga&rft.inst=Andhra+Pradesh+Agricultural+University&rft.date=1983&rft.title=Studies+on+the+magnitude+and+nature+of+hybrid+vigour+utilizing+male+sterile+and+fertile+lines+in+pigeonpea+(Cajanus+Cajan(L.)mill+sp)&rft.degree=Masters