Czejka, M.J., G. Pakfeifer, E. Mayr, K. Kafka, and A. Farkouh. 2011. “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 1 (2):104-10. https://doi.org/10.6000/1927-5951.2011.01.02.03.