PACS:64.60.Fr, 64.60.Kw, 64.70.−p (all) DOI:10.1070/PU1981v024n01ABEH004612 URL: https://ufn.ru/en/articles/1981/1/d/ Citation: Anisimov M A, Gorodetskii E E, Zaprudskii V M "Phase transitions with coupled order parameters" Sov. Phys. Usp.24 57–75 (1981)