1. Anderson, Phytopathology 47: 515, 1957.
  2. Badami, Ann. appl. Biol. 46: 554, 1958.
  3. Bhargava, Ann. appl. Biol. 38: 377, 1951.
  4. Doolittle, Phytopathology 6: 145, 1916.
  5. Finch, Klug & Van Regenmortel, J. mol. Biol. 24: 303, 1967.
  6. Francki, Randles, Chambers & Wilson, Virology 28: 729,1966.
  7. Hollings, Ann. appl. Biol. 43: 86, 1955.
  8. Jagger, Phytopathology 6: 148, 1916.
  9. Kaper, Diener & Scott, Virology 27: 54, 1965.
  10. Kennedy, Day & Eastop, A conspectus of aphids as vectors of plant viruses. London, Commonwealth Institute of Entomology, 1962.
  11. Lawson, Virology 32: 357, 1967.
  12. Murant, Virology 26: 538, 1965.
  13. Price, Phytopathology 24: 743, 1934.
  14. Price, Amer. J. Bot. 27: 530, 1940.
  15. Schmelzer, Phytopath. Z. 28: 1, 1956.
  16. Scott, Virology 20: 103, 1963.
  17. Scott, Virology, 34: 79, 1968.
  18. Van Regenmortel, Virology 23: 495, 1966.
  19. Van Regenmortel, Virology 31: 391, 1967.