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Tibbetts, Todd A., Franco DeMayo, Susan Rich, Orla M. Conneely, and Bert W. O’Malley. "Progesterone Receptors in the Thymus Are Required for Thymic Involution During Pregnancy and for Normal Fertility." Proc Natl Acad Sci U S A 1999.

Tibbetts, Todd A., et al. "Progesterone Receptors in the Thymus Are Required for Thymic Involution During Pregnancy and for Normal Fertility." Proc Natl Acad Sci U S A 1999.