1. A plasmid cloning vector for the direct selection of strains carrying recombinant plasmids;Dean;Gene,1981
2. Broad host range DNA cloning system for Gram-negative bacteria: construction of a gene bank of Rhizobium meliloti;Ditta,1980
3. Replication of an origincontaining derivative of plasmid RK2 dependent on a plasmid function provided in trans;Figurski,1979
4. Replacement and amplification of bacterial genes with sequences altered in vitro;Gutterson,1983
5. A small cosmid for efficient cloning of large DNA fragments;Hohn;Gene,1980