Excitonic photoluminescence spectra of C60 single crystals grown by different techniques V. Capozzi, M. Santoro, G. Perna, G. Celentano, A. Minafra and G. Casamassima Eur. Phys. J. AP, 14 1 (2001) 3-11 Published online: 15 April 2001 DOI: 10.1051/epjap:2001135