1. Ainsworth & Ogilvie, Ann. appl. Biol. 26: 279, 1939.
  2. Brandes & Bercks, Adv. Virus Res. 11: 1, 1965.
  3. Broadbent, Tinsley, Buddin & Roberts, Ann. appl. Biol. 38: 689, 1951.
  4. Costa & Duffus, Pl. Dis. Reptr 42: 583, 1958.
  5. Couch, Phytopathology 45: 63, 1955.
  6. Dickson & Laird, J. econ. Ent. 52: 440, 1959.
  7. Fry, N.Z. Jl Sci. Technol. Sect. A 33: 52, 1952.
  8. Grogan, Welch & Bardin Phytopathology 42: 573, 1952.
  9. Jagger, J. agric. Res. 20: 739, 1921.
  10. Kassanis, Ann. appl. Biol. 34: 412, 1947.
  11. Kemper, Z. PflKrankh. PflPath. PflSchutz 69: 653, 1962.
  12. Kennedy, Day & Eastop, A conspectus of aphids as vectors of plant viruses, London, Commonwealth Institute of Entomology, 1962.
  13. Klisiewicz, Pl. Dis. Reptr 49: 541, 1965.
  14. McLean & Kinsey, Phytopathology 52: 403, 1962.
  15. McLean & Kinsey, Pl. Dis. Reptr 47: 474, 1963.
  16. Newhall, Phytopathology 13: 104, 1923.
  17. Ryder, Pl. Dis. Reptr 48: 522, 1964.
  18. Sylvester, Phytopathology 45: 357, 1955.
  19. Tomlinson, Pl. Path. 11: 61, 1962.
  20. Tomlinson, Ann. appl. Biol. 53: 95, 1964.
  21. Van Hoof, Tijdschr. PlZiekt. 65: 44, 1959.
  22. Zink, Grogan & Welch, Phytopathology 46: 662, 1956.