1. Burgess, R. R. in RNA Polymerase (eds Losick, R. & Chamberlin, M.) 69–100 (Cold Spring Harbor Laboratory, New York, 1976).
2. Scaife, J. in RNA Polymerase (eds Losick, R. & Chamberlin, M.) 207–226 (Cold Spring Harbor Laboratory, New York, 1976).
3. Errington, L., Glass, R. E., Hayward, R. S. & Scaife, J. G. Nature 249, 519–522 (1974).
4. Dennis, P. P. J. molec. Biol. 115, 603–625 (1977).
5. Glass, R. E., Goman, M., Errington, L. & Scaife, J. Molec. gen. Genet. 143, 79–83 (1975).