Abascal, P. L., Luzar-Stiffler, V., Giljanovic, S., Howard, B., Weiss, H., & Trussell, J. (2015). Differences in Reporting Pearl Indices in the United States and Europe: Focus on a 91-Day Extended-Regimen Combined Oral Contraceptive with Low-Dose Ethinyl Estradiol Supplementation. Eur J Contracept Reprod Health Care.

Abascal, Paloma Lobo, Vesna Luzar-Stiffler, Silvana Giljanovic, Brandon Howard, Herman Weiss, and James Trussell. "Differences in Reporting Pearl Indices in the United States and Europe: Focus On a 91-Day Extended-Regimen Combined Oral Contraceptive With Low-Dose Ethinyl Estradiol Supplementation." Eur J Contracept Reprod Health Care 2015.

Abascal, Paloma Lobo, et al. "Differences in Reporting Pearl Indices in the United States and Europe: Focus On a 91-Day Extended-Regimen Combined Oral Contraceptive With Low-Dose Ethinyl Estradiol Supplementation." Eur J Contracept Reprod Health Care 2015.