State Vectors in the Collective Description
Toshiyuki Nishiyama · Progress of Theoretical Physics · 1956
Progress of Theoretical Physics Vol. 17 No. 5 (1957) pp. 711–732 On Collective and Internal Motions in a Bose System Toshiyuki Nishiyama Progress of Theoretical Physics Vol. 38 No. 5 (1967) pp. 1062–1082 Interaction of an Individual Particle with Phonons in an Interacting Many-Boson System Toshiyuki Nishiyama