Terahertz beats of vibrational modes studied by femtosecond coherent Raman spectroscopy R. Leonhardt, W. Holzapfel, W. Zinth et W. Kaiser Rev. Phys. Appl. (Paris), 22 12 (1987) 1735-1741 DOI: 10.1051/rphysap:0198700220120173500