premise: Studia Mathematica is a Polish mathematics journal published since 1929. It was founded by Stefan Banach and Hugo Steinhaus. It accepts papers written in English, French, German, or Russian, primarily in functional analysis and related areas such as probability theory.
hypothesis: Studia Mathematica accepts papers written in English, French, German, or Russian but in fact, was a  Russian language magazine by  Stefan Banach and Hugo Steinhaus.
reason:  Papers are written in English, French, German, or Russian, primarily covering functional analysis, abstract methods of mathematical analysis, and probability theory not only Russian.