Эпісталярная норма беларускай літаратурнай мовы: станаўленне і дынаміка, традыцыі і інавацыі

In this paper the author outlines an evolution of the Belarusian system of epistolary models of the end of the 19th century and the beginnings of the 20th century. This system develops under influence of Polish system (the end of the 19th century – the 1910s) and Russian system (starting from the end of 1920s), also under influence of purists’ opinions of the Belarusian cultured intelligentsia doing the rate on use of own language resources and on preservation of national identity and an originality of the Belarusian language (the 1920s; the 1990s – the beginnings of the 21st century)