Schwartz, F., Maeda, N., Smithies, O., Hickey, R., Edelmann, W., Skoultchi, A., & Kucherlapati, R. (1991). A dominant positive and negative selectable gene for use in mammalian cells. Proc Natl Acad Sci U S A.

Schwartz, F., N. Maeda, O. Smithies, R. Hickey, W. Edelmann, A. Skoultchi, i R. Kucherlapati. "A Dominant Positive and Negative Selectable Gene for Use in Mammalian Cells." Proc Natl Acad Sci U S A 1991.

Schwartz, F., et al. "A Dominant Positive and Negative Selectable Gene for Use in Mammalian Cells." Proc Natl Acad Sci U S A 1991.