Зелений шлях відкритого доступу. Репозитарії та їх роль у науковій комунікації: перші двадцять років

The paper is devoted to Open Access to scholar information via creating OA journals and institutional and subject repositories as the mosteffective way of modern scholar communication. Detailed characteristics of repositories are described. All their policies, peculiarities,kinds, types of content, functional features are discussed.