1. Dolby & Jones, Ann. appl. Biol. 112: 231, 1988.
  2. Francki, Milne & Hatta, An Atlas of Plant Viruses, Vol. II, CRC Press, Boca Raton, 248 pp., 1985.
  3. Jones, Koenig & Lesemann, Ann. appl. Biol. 94: 61, 1980.
  4. Thomas, Mohamed & Fry, Ann. appl. Biol. 95: 191, 1980.