Czejka, M., G. Pakfeifer, E. Mayr, K. Kafka, and A. Farkouh. “Long Term Ingestion of Hormonal Contraceptive Agents – The Exogenous Factor for the Increased Generation of Reactive Oxygen Species (ROS)?”. Journal of Pharmacy and Nutrition Sciences, vol. 1, no. 2, Jan. 2011, pp. 104-10, doi:10.6000/1927-5951.2011.01.02.03.