1. Freitag & Milne, Phytopathology 60: 166, 1970.
  2. Gibbs, Varma & Woods, Ann. appl. Biol. 58: 231, 1966.
  3. Graves & Hagedorn, Phytopathology 46: 257, 1956.
  4. Hagedorn, Bos & van der Want, Tijdschr. PlZiekt. 65: 13, 1959.
  5. Matsulevich, Agrobiology, Moscow 2: 75, 1957.
  6. Osborn, Phytopathology 27: 1051, 1937.
  7. Rubio-Huertos, Microbiologia esp. 17: 1, 1964.
  8. Sänder Phytopathology 49: 748, 1959.
  9. Stuteville & Hanson, Phytopathology 55: 336, 1965.
  10. Varma, Gibbs, Woods & Finch, J. gen. Virol. 2: 107, 1968.
  11. Varma, Gibbs & Woods, J. gen. Virol. 8: 21, 1970.
  12. Varma, P. & Gibbs, Ann. appl. Biol. 59: 23, 1967.
  13. Wetter, Quantz & Brandes, Phytopath. Z. 44: 151, 1962.
  14. Wilcoxson & El-Kandelgy, Phytopathology 56: 364, 1966.
  15. Zaumeyer, Goth & Ford, Pl. Dis. Reptr 48: 494, 1964.