?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.aufirst=P+L&rft.au=Kumar%2C+P+L&rft.aulast=Kumar&rft.inst=Sri+Venkateswara+University(Tirupati)&rft.date=1999&rft.title=Studies+on+pigeonpea+sterility+mosaic+disease%3A+isolation+ad+characterisation+of+the+causal+agent+and+assessment+of+genetic+variation+within+and+between+ppulations+of+the+mite+vector%2C+aceria+cajani+&rft.tpages=213&rft.degree=PHD