1. Barton, J. gen. Virol. 35: 77, 1977.
2. Hollings & Stone, Rep. Glasshouse Crops Res. Inst. for 1962: 90, 1963.
3. Hollings & Stone, Ann. appl. Biol. 56: 87, 1965.
4. Hollings, Stone & Barton, Ann. appl. Biol. 86: 233, 1977.
5. Hollings, Stone & Pawley, Rep. Glasshouse Crops Res. Inst. for 1975: 120, 1976.