Phonon spectra and heat capacity of Li2B4O7 and LiB3O5 crystals V. V. Maslyuk, T. Bredow and H. Pfnür Eur. Phys. J. B, 42 4 (2004) 461-466 Published online: 18 January 2005 DOI: 10.1140/epjb/e2005-00003-1