https://www.vedomosti.ru/business/articles/2011/08/16/pfizer_sohranil_patent_na_lekarstvo_ot_impotencii?utm_source=telegram&utm_campaign=share&utm_medium=social&utm_content=pfizer_sohranil_patent_na_lekarstvo_ot_impotencii
Pfizer сохранила патент на Viagra Канал «Ведомостей» @vedomosti