1. Bhargava, K. S. &R. D. Joshi, — 1959. A virus disease of tree tomato — Cyphomandra Sendt — due to potato virus Y. Am. Pot. J. 36: 288–292.
2. Bode, O. &J. Völk, — 1957. Beobachtungen über einen neuen Stamm des Kartoffel-Y-Virus. Kartoffelbau 8: 140–141.
3. Bode, O., — 1959. Recherches sur le virus de la maladie des cotes brunes du tabac. Act. 2e Congr. scient. int. Tabac, Bruxelles, 1958: 93–96.
4. Cockerham, G., — 1958. Experimental breeding in relation to virus resistance. Proc. 3rd Conf. Pot. Virus Dis., Wageningen — Lisse, 1957: 199–203.
5. Easton, G. D., R. H. Larson & R. W. Hougas, — 1958. Immunity to virus Y in the genus Solanum. Res. Bull. 205., Univ. Wisconsin.