Excitons, magnons and phonons in molecular crystals: proceedings of an international symposium held at the Physics Department of the American University of Beirut, Lebanon, 15-18 January, 1968 / edited by A. B. Zahlan. Molecular crystals. Zahlan, A. B. (Antoine Benjamin), 1928- ed. American University of Beirut. Department of Physics. Molecular crystals Congresses. Exciton theory Congresses. Phonons Congresses. QC176.A1 E9 541.22 19 ZAE London : Cambridge U.P., 1968. 1968. 1968 Text x, 224 p. : eng