Adiabatic and isothermal sound waves: The case of supercritical nitrogen F. Bencivenga, A. Cunsolo, M. Krisch, G. Monaco, G. Ruocco and F. Sette Europhys. Lett., 75 1 (2006) 70-76 Published online: 02 June 2006 DOI: 10.1209/epl/i2006-10091-y