@unpublished{icrisat941,
          school = {Sri Venkateswara University(Tirupati)},
            year = {1999},
           title = {Studies on pigeonpea sterility mosaic disease: isolation ad characterisation of the causal agent and assessment of genetic variation within and between ppulations of the
mite vector, aceria cajani
},
          author = {P L Kumar},
             url = {http://oar.icrisat.org/941/}
}