1. Asjes, Versi. Werkzaamh. Bloembollen Onderz. Lisse 1968-69: 44, 1969.
  2. Barnett, De Zoeten & Gaard, Phytopathology 61: 926, 1971.
  3. Baruch & Quak, Neth. J. Pl. Path. 72: 270, 1966.
  4. Brierley & McWhorter, J. agric. Res. 53: 621, 1936.
  5. Brunt, Ann. appl. Biol. 61: 187, 1968.
  6. Kassanis & Broadbent, Rep. Rothamsted exp. Stn 1957: 106, 1958.
  7. Lawson, Pl. Dis. Reptr 51: 952, 1967.
  8. Loebenstein & Alper, Phytopathology 53: 349, 1963.
  9. Martyn, Commonw. Phytopath. Papers 9: 56, 1968.
  10. Van Slogteren, Versl. Werkzaamh. Bloembollen Onderz. Lisse 1962: 80, 1963.
  11. Stone & Hollings, Rep. Glasshouse Crops Res. Inst. 1964: 95, 1965.