The study provides a systematic and detailed assessment of research into the mentioned issue. The research initially experienced a deep decline in the post-November period, which was followed by a hesitant revival with certain specificity. The author performed complete quantitative and qualitative analyses of existing outputs. In the second part, he concentrated on analyses of particular topics. He compared them with foreign production and contemplated on gaps in the research and finding needy, but not yet elaborated topics. He summed up not only outcomes of scholarly studies, articles and publications, but also commented on editorial activity and documents from Czech and relevant foreign, particularly Russian, archives.