Sivin, Irving, Daniel R. Mishell, Jr., Francisco Alvarez, Vivian Brache, Kaisa Elomaa, Pekka Lähteenmäki, Rebeca Massai, Patricia Miranda, Horacio Croxatto, Catherine Dean, Margaret Small, Harold A. Nash, and Theodore M. Jackanicz. 2005. "Contraceptive vaginal rings releasing Nestorone® and ethinylestradiol: A 1-year dose-finding trial," Contraception 71(2): 122–129. (abstract)

Skoler, Stephanie, Sumen Govender, Lydia Altini, Khatija Ahmed, Donald Waldron, Landon Myer, and Pekka Lähteenmäki. 2005. "Risks in the use of an unblinded control group (letter)," Journal of Infectious Diseases 191(8): 1378–1379.

Heikinheimo, Oskari, Raimo Kekkonen, and Pekka Lähteenmäki. 2003. "The pharmacokinetics of mifepristone in humans reveal insights into differential mechanisms of antiprogestin action," Contraception 68(6): 421–426.

Ylänen, Kaija, Timo Laatikainen, Pekka Lähteenmäki, and Alfred J. Moo-Young. 2003. "Subdermal progestin implant (Nestorone®) in the treatment of endometriosis: Clinical response to various doses," Acta Obstetricia et Gynecologica Scandinavica 82(2): 167–172.

Maruo, Takeshi, Jovelle B. Laoag-Fernandez, Hiroya Matsuo, Takashi Samoto, Osamu Kurachi, S. Takeuchi, Irving M. Spitz, Paivi Pakarinen, Pekka Lähteenmäki, and Elof D. B. Johansson. 2002. "Effects of levonorgestrel-releasing intrauterine system on the endometrium and the relevance to the management of menorrhagia caused by uterine myoma and adenomyosis," in Takeshi Maruo, David Barlow, Helen Mardon, and Stephen Kennedy (eds.), Cell and Molecular Biology of Endometrium in Health and Disease. Osaka: Soeisha, pp. 193–207.

Elomaa, Kaisa, Sirpa Ranta, Juhani Tuominen, and Pekka Lähteenmäki. 2001. "The possible role of enterothepatic cycling on bioavailability of noretisterone and gestodene in women using combined oral contraceptives," Contraception 63(1): 13–18.

Brache, Vivian, Francisco Alvarez-Sanchez, Aníbal Faúndes, Theodore M. Jackanicz, Daniel R. Mishell, Jr., and Pekka Lähteenmäki. 2000. "Progestin-only contraceptive rings," Steroids 65(10–11): 687–691.

Fraser, Ian S., Maria Lacarra, Daniel R. Mishell, Jr., Francisco Alvarez-Sanchez, Vivian Brache, Pekka Lähteenmäki, Kaisa Elomaa, Edith Weisberg, and Harold A. Nash. 2000. "Vaginal epithelial surface appearances in women using vaginal rings for contraception," Contraception 61(2): 131–138.

Lähteenmäki, Pekka, Ilkka Rauramo, and Tiina Backman. 2000. "The levonorgestrel intrauterine system in contraception," Steroids 65(10–11): 693–697.

Noe, G. J. Suvissari, C. Martin, A.J. Moo-young, K. Sundaram, S.I. Saleh, E. Quintero, H.B. Croxatto, and Pekka Lähteenmäki. 1999. "Gonadotropin and testosterone suppression by 7α-methyl-19-nortesterone acetate administered by subdermal implant to healthy men," Human Reproduction 14(9): 2200–2206.

Lähteenmäki, Pekka, M. Haukkamaa, J. Puolakka, U. Riikonen, S. Sainio, J. Suvisaari, and C.G. Nilsson. 1998. "Open randomised study of use of levonorgestrel-releasing intrauterine system as alternative to hysterectomy," British Medical Journal 316(7138): 1122–1126.