D. A. Jackson, R. H. Symons, and P. Berg, “Biochemical Method for Inserting New Genetic Information into DNA of Simian Virus 40: Circular SV40 DNA Molecules Containing Lambda Phage Genes and the Galactose Operon of Escherichia coli”, Proceedings of the National Academy of Sciences of the United States of America 69 (1972): 2904–2909.
