1. Benson, A P, and Hooker, W J. 1960a. Isolation of virus X from “immune” varieties of potato, Solanum tuberosum. Phytopath, 50, 629.
2. Benson, A P, and Hooker, W J. 1960b. Carbohydrate reserves in grafted plants of potato varieties resistant to virus X. Phytopath, 50, 629.
3. Black, W. 1956. Breeding potatoes for resistance to virus and other agents of disease. Genetica Agraria, 7, 1–2.
4. Cadman, C H. 1942. Autotetraploid inheritance in the potato: some new evidence. J Genet, 44, 33–52.
5. Cookerham, G. 1939. The distribution and significance of certain potato viruses in Scotland. Scot J Agric, 22, 1–11.