1. Carpenter, Cook & Gibbs, Rep. Rothamsted exp. Stn 1970: 122, 1971.
2. Frowd, Ph.D. Thesis, University of Birmingham, 1971.
3. Frowd & Tomlinson, Pl. Dis. Reptr 54: 734, 1970.
4. Gibbs, Hecht-Poinar, Woods & McKee, J. gen. Microbiol. 44: 177, 1966.
5. Gibbs, Giussani-Belli & Smith, Ann. appl. Biol. 61: 99, 1968.
6. Hull & Plaskitt, Rep. John Innes Inst. 1970: 69, 1971.
7. Jensen, Phytopathology 40: 967, 1950.
8. Kim & Hagedorn, Phytopathology 49: 656, 1959.
9. Murant & Goold, Rep. Scott. hort. Res. Inst. 1971: 64, 1972.
10. Rubio, Microbiol. esp. 12: 325, 1959.
11. Rubio-Huertos, Microbiol. esp. 15: 1, 1962.
12. Rubio-Huertos, Protoplasma 65: 465, 1968.
13. Sahambi, Milne & Phillips, Rep. Rothamsted exp. Stn 1969: 143, 1970.
14. Schmelzer, Z. PflKrankh. PflPath. PflSchutz 67: 193, 1960.
15. Schmelzer & Wolf, Zentbl. Bakt. ParasitKde Abt. 2 123: 577, 1969.
16. Schroeder & Provvidenti, Phytopathology 60: 1405, 1970.
17. Schumann, Phytopath. Z. 48: 135, 1963.
18. Smith, Jl R. hort. Soc. 74: 482, 1949a.
19. Smith, Jl R. hort. Soc. 74: 521, 1949b.
20. Smith, Jl R. hort. Soc. 75: 350, 1950.
21. Stubbs, J. Dep. Agric. Vict. 46: 323, 1947.
22. Stubbs, Aust. J. agric. Res. 11: 734, 1960.
23. Taylor, Smith, Reinganum & Gibbs, Aust. J. biol. Sci. 21: 929, 1968.
24. Wolf, Acta phytopath. Acad. Sci. hung. 5: 95, 1970.