INTERNAL AND EXTERNAL PHONONS IN MONOCLINIC TETRACYANOETHYLENE S.L. Chaplot, A. Mierzejewski, J. Lefebvre, G.S. Pawley et T. Luty J. Phys. Colloques, 42 C6 (1981) C6-584-C6-586 DOI: 10.1051/jphyscol:19816170