Surface melting and preroughening of argon: An X-ray reflection study F. Rieutord, R. Simon, R. Conradt and P. Müller-Buschbaum Europhys. Lett., 37 8 (1997) 565-570 Published online: 01 September 2002 DOI: 10.1209/epl/i1997-00181-4