1. Bartels, Phytopath. Z. 49: 257, 1964.
  2. Bawden & Kassanis, Ann. appl. Biol. 28: 107, 1941.
  3. Bawden & Kassanis, Ann. appl. Biol. 32: 52, 1945.
  4. Bennett, Phytopathology 34: 905, 1944.
  5. Brandes & Wetter, Virology 8: 99, 1959.
  6. Christie, Virology 31: 268, 1967.
  7. Damirdagh & Shepherd, Phytopathology 60: 132, 1970a.
  8. Damirdagh & Shepherd, Virology 40: 84, 1970b.
  9. Edwardson, Am. J. Bot. 53: 359, 1966.
  10. Edwardson, Purcifull & Christie, Virology 34: 250, 1968.
  11. Gooding & Bing, Phytopathology 60: 1293, 1970.
  12. Greenleaf, Phytopathology 43: 564, 1953.
  13. Hiebert, Purcifull, R. Christie & S. Christie, Virology 43: 688, 1971.
  14. Holmes, Phytopathology 36: 643, 1946.
  15. Johnson, Bull. Ky agric. Exp. Stn 306: 289, 1930.
  16. Kahn & Bartels, Phytopathology 58: 587, 1968.
  17. Kassanis, Ann. appl. Biol. 26: 705, 1939.
  18. Kassanis, Ann. appl. Biol. 28: 238, 1941.
  19. Kennedy, Day & Eastop, A conspectus of aphids as vectors of plant viruses, London, Commonwealth Institute of Entomology, 1962.
  20. Laird & Dickson, Phytopathology 53: 48, 1963.
  21. Purcifull, Virology 29: 8, 1966.
  22. Purcifull & Gooding, Phytopathology 60: 1036, 1970.
  23. Purcifull & Shepherd, Phytopathology 54: 1102, 1964.
  24. Purcifull, Edwardson & Christie, Phytopathology 60: 779, 1970.
  25. Schmelzer, Phytopath. Z. 60: 301, 1967.
  26. Schmelzer, Bartels & Klinkowski, Phytopath. Z. 40: 52, 1960.
  27. Sheffield, Jl R. microsc. Soc. 61: 30, 1941.
  28. Shepherd, Fulton & Wakeman, Phytopathology 59: 219, 1969.