TY JOUR TI AN INNOVATIVE MODEL OF TEACHING MATERIALS IN RUSSIAN AS A FOREIGN LANGUAGE FOR STUDENT TRAINEES (I-III CERTIFICATES TRFL LEVELS) KW teaching method of Russian language as a foreign language in short-term courses KW Russian language manual JO Linguistics & Education AU Zueva, L.E. AU Mamontova, M.G. PY 2022 IS 2 PB Astrakhan State Medical University