1. Appel, O. 1906. Neuere Untersuchungen über Kartoffel-und Tomaten Erkrankungen. Jahresber. Vereinig, angewandten Bot. 3 Jahrg. 1904/5, pp. 122–136.
2. Bagnali, R.H., Larson, R.H. and Walker, J.C, 1956. Potato viruses, M, S, and X in relation to interveinai mosaic of the Irish Cobbler variety. Wis. Agr. Exp. Sta. Res. Bul. 198:1–43.
3. Bawden, F.C. 1956. Plant Viruses and Virus Diseases. pp. 1–335. Chronica Botanica Company, Waltham, Mass.
4. Botjes, O.J 1920. Inaugural Dissertation, Wageningen In: Smith, K.M. 1931. Biological Rev. 6, 302.
5. Boulton, R.E., Jellis, G.J., Balcombe, D.C. and Squire, A.M. 1986. The application of complementary DNA probes to routine virus detection, with particular reference to potato viruses. In: Developments and Applications in Virus Testing. (eds) R.A.C. Jones and L. Torrance, pp.41–45. Lavenham Press, Lavenhaven, Sudbury, England.