1. Allen, Virology 47: 467, 1972.
  2. Allen & Fernald, Pl. Dis. Reptr 55: 546, 1971.
  3. Anderegg, Geil, Beeman & Kaesberg, Biophys. J. 1: 657, 1961.
  4. Bekker, M. Sc. Thesis, University of Stellenbosch, 75 pp., 1967.
  5. Brunt, Kenten, Gibbs & Nixon, J. gen. Microbiol. 33: 81, 1965.
  6. Dunn & Hitchborn, Virology 25: 171, 1965.
  7. Freitag, Phytopathology 31: 8, 1941.
  8. Freitag, Phytopathology 42: 8, 1952.
  9. Grogan, Taylor & Kimble, Phytopathology 54: 163, 1964.
  10. Hitchborn & Dunn, Virology 26: 441, 1965.
  11. Hitchborn & Hills, Virology 26: 756, 1965.
  12. Lindberg, Hall & Walker, Phytopathology 46: 489, 1956.
  13. MacLeod & Markham, Virology 19: 190, 1963.
  14. Markham, Adv. Virus Res. 9: 241, 1962.
  15. Markham, In Methods in Virology 2: 1, ed. K. Maramorosch & H. Koprowski, Academic Press, New York and London, 1967.
  16. Milne, Grogan & Kimble, Phytopathology 59: 819, 1969.
  17. Sinclair, Geil & Kaesberg, Phytopathology 47: 372, 1957.
  18. Symons, Rees, Short & Markham, J. molec. Biol. 6: 1, 1963.
  19. Ushiyama & Matthews, Virology 42: 293, 1970.
  20. Van Regenmortel, Proc. internat. Conf Plant Viruses, Wageningen, 1965: 213, 1966.
  21. Van Regenmortel, S. Afr. med. J. 42: 118, 1968.
  22. Walters, Adv. Virus Res. 15: 339, 1969.
  23. Yamazaki & Kaesberg, Biochim. biophys. Acta 51: 9, 1961a.
  24. Yamazaki & Kaesberg, Biochim. biophys. Acta 53: 173, 1961b.