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Singer, Michael J., Larry D. Mesner, Cynthia L. Friedman, Barbara J. Trask, a Joyce L. Hamlin. "Amplification of the Human Dihydrofolate Reductase Gene Via Double Minutes Is Initiated By Chromosome Breaks." Proc Natl Acad Sci U S A 2000.

Singer, Michael J., et al. "Amplification of the Human Dihydrofolate Reductase Gene Via Double Minutes Is Initiated By Chromosome Breaks." Proc Natl Acad Sci U S A 2000.