TY JOUR TI Creation of film coverings on a basis of chitosan the prolonged action KW chitosan KW modification KW medicinal preparation KW the state of polymer matrix KW хитозан KW модификация KW лекарственное вещество KW состояние полимерной матрицы JO Herald of Technological University AU Shurshina, A.S. AU Lazdin, R.Y. AU Bazunova, M.V. AU Zaikov, G.E. PY 2025 IS 17 PB Kazan National Research Technological University