1. Genetic and physical studies on the replication of Col E1-type plasmids;Backman,1978
2. Origin of replication of pBR345 plasmid DNA;Bolivar,1977
3. Supercoiled circular DNA-protein complex in Escherichia coli: purification and induced conversion to an open circular DNA form;Clewell,1969
4. Characterization of an improved in vitro DNA replication system for Escherichia coli plasmids;Conrad;Nucl. Acids Res.,1979
5. Origin and direction of plasmid RSF1030 DNA replication;Conrad,1979