TY - BOOK AU - Дядюша, Г.Г. AU - Крячко, Е.С. TI - Algebraic structure of density matrices for excited states T2 - Preprint VL - ITP-79-28E PY - 1979/// CY - Kiev PB - Б. и. KW - Г511.21,0 KW - rubbk N2 - Библиогр.: с. 10 ER -