Thermo field dynamics and condensed states / H. Umezawa and H. Matsumoto [and] M. Tachiki. Umezawa, H. (Hiroomi), 1924- Matsumoto, H. Tachiki, M. (Masashi), 1931- Quantum field theory. Many-body problem. QC174.45 .U526 1982 530.143 19 UMT Includes bibliographical references and index. Amsterdam ; New York : North-Holland Pub. , c1982. c1982. 1982 Text xvi, 591 p. : eng