1. American Type Culture Collection, 1981, Catalogue of Strains II, Rockville, Md.
2. Boedtker, H., and Simmons, N. S., 1958, The preparation and characterization of essentially uniform tobacco mosaic virus particles, J. Am. Chem. Soc. 80: 2550.
3. Brandes, J., and Wetter, C., 1959, Classification of elongated plant viruses on the basis of particle morphology, Virology 8: 99.
4. Chessin, M., Zaitlin, M., and Solberg, R. A. 1967, A new strain of tobacco mosaic virus from Lychnis alba, Phytopathology 57: 452.
5. Chessin, M, Juretic, N., Milicic, D., Perryman, J., and Giri, L., 1980, A distinctive strain of ribgrass mosaic virus from Montana, USA, Phytopathol. Z. 97: 295.