1. Brandes & Luisoni, Phytopath. Z. 57: 277, 1966.
2. Chod, Ochr. Rost. 3: 49, 1965.
3. Férault, Lapierre, Spire & Bertrandy, Annls Phytopath. 1: 303, 1969.
4. Iwaki & Komuro, Ann. phytopath. Soc. Japan 36: 36, 1970.
5. Murant & Goold, Ann. appl. Biol. 62: 123, 1968.
6. Murant & Goold, Rep. Scott. hort. Res. Inst. 1971 64, 1972.
7. Murant, Munthe & Goold, Ann. appl. Biol. 65: 127, 1970.
8. Murant & Roberts, J. gen. Virol. 10: 65, 1971.
9. Polák, Biologia Pl. 8: 73, 1966.
10. Shepherd & Grogan, CMI/AAB Descriptions of Plant Viruses 50, 4 pp., 1971.
11. Singh & López-Abella, Phytopathology 61: 333, 1971.
12. Sutabutra & Campbell, Pl. Dis. Reptr 55: 328, 1971.
13. Wolf, Mber. dt. Akad. Wiss. Berl. 11: 293, 1969.