Kotzev J.N. Permutational magnetic point groups and their application in the Landau theory of phase transitions. General theory and chromomorphic classification / J.N.Kotzev,S.S.Tzonev, 1990. - 15 p. - Текст : непосредственный.
Kotzev J.N. Permutational magnetic point groups and their application in the Landau theory of phase transitions. Complete list of tables / J.N.Kotzev,S.S.Tzonev, 1990. - 13 p. - Текст : непосредственный.