Spence, P., Nel, A., van Niekerk, N., Derrick, T., Wilder, S., & Devlin, B. (2016). Post-use assay of vaginal rings (VRs) as a potential measure of clinical trial adherence. J Pharm Biomed Anal.

Spence, Patrick, Annalene Nel, Neliëtte van Niekerk, Tiffany Derrick, Susan Wilder, ja Bríd Devlin. "Post-use Assay of Vaginal Rings (VRs) As a Potential Measure of Clinical Trial Adherence." J Pharm Biomed Anal 2016.

Spence, Patrick, et al. "Post-use Assay of Vaginal Rings (VRs) As a Potential Measure of Clinical Trial Adherence." J Pharm Biomed Anal 2016.