TY - RPRT TI - Thermophysical properties of Helium-4 from 0.8 to 1500 K with pressures to 2000 MPa AU - Arp, V D PY - 1998 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS TN 1334 DO - 10.6028/NIST.TN.1334 ER -