Ringold, F. G., Minkowitz, H. S., Gan, T. J., Aqua, K. A., Chiang, Y., Evashenk, M. A., & Palmer, P. P. (2015). Sufentanil Sublingual Tablet System for the Management of Postoperative Pain Following Open Abdominal Surgery: A Randomized, Placebo-Controlled Study. Reg Anesth Pain Med.

Ringold, Forrest G., Harold S. Minkowitz, Tong Joo Gan, Keith A. Aqua, Yu-kun Chiang, Mark A. Evashenk, e Pamela P. Palmer. "Sufentanil Sublingual Tablet System for the Management of Postoperative Pain Following Open Abdominal Surgery: A Randomized, Placebo-Controlled Study." Reg Anesth Pain Med 2015.

Ringold, Forrest G., et al. "Sufentanil Sublingual Tablet System for the Management of Postoperative Pain Following Open Abdominal Surgery: A Randomized, Placebo-Controlled Study." Reg Anesth Pain Med 2015.