Vesa Apaja, Eckhard Krotscheck,
"Layer- and bulk-roton excitations of 4He in porous media"
, in Physical Review Letters, Serie 22, Vol. 91, Nummer 22, Seite(n) 225302, 11-2003, ISSN: 0031-9007
Original Titel:
Layer- and bulk-roton excitations of 4He in porous media