THz phonon spectroscopy of doped superconducting cuprates
  Terahertz phonon spectroscopy studies of bismuth cuprates are overviewed. 
Ya. G. Ponomarev, Hoang Hoai Van, S. A. Kuzmichev, S. V.   Kulbachinskii, M. G. Mikheev, M. V. Sudakova, S. N. Tchesnokov
cond-mat.supr-con