1. Replication in the amplified dihydrofolate reductase domain in CHO cells may initiate at two distinct sites, one of which is a repetitive element;Anachkova;Mol. Cell. Biol.,1989
2. Tandem genetic duplications in phage and bacteria;Anderson;Annu. Rev. Microbiol.,1977
3. Mitogenic hormones and tumor promoters greatly increase the incidence of colony-forming cells bearing amplified dihydrofolate reductase;Barsoum,1983
4. Evidence for transient existence of amplified DNA sequences in antifolate-resistant, vincristine-resistant and human neuroblastoma cells;Biedler,1982
5. A novel chromosome abnormality in human neuroblastoma and antifolate-resistant Chinese hamster cells in culture;Biedler;J. Natl. Cancer Inst.,1975