- Bazaral M and Helinski DR. Circular DNA forms of colicinogenic factors E1, E2 and E3 from Escherichia coli. J Mol Biol. 1968 Sep 14;36(2):185-94.
original discovery of ColE1 plasmid
- Hershfield V, Boyer HW, Yanofsky C, Lovett MA, and Helinski DR. Plasmid ColEl as a molecular vehicle for cloning and amplification of DNA. Proc Natl Acad Sci U S A. 1974 Sep;71(9):3455-9.
use of ColEI as a vector