1. MoralesF.J. and NiessenA.L.,Description of plant viruses. CMI/AAB, Kew, England, 1985, No 299.
2. FalkB.W., MoralesF.J., TsaiJ.H., and NiessenA.I., Phytopath77, 196?201, 1987.
3. GingeryR.E. in MilneR.G. (ed).,The plant viruses, (vol 4). Plenum Press, New York, 1988, pp. 297?329.
4. vanHoofH.A., Tijdsch Plantenziekten65, 188?189, 1959.
5. Madriz J., de Miranda J.R., Muñoz M., Bonilla J.A., Wu R., and Espinoza A.M., J Gen Vir (submitted).