TY - RPRT TI - Elastic wave speeds and moduli in polycrystalline ice Ih, si methane hydrate, and sll methane-ethane hydrate AU - M.B. Helgerud AU - W.F. Waite AU - S. H. Kirby AU - A. Nur PY - 2009 DO - 10.1029/2008jb006132 UR - https://pubs.usgs.gov/publication/70036092 ID - 70036092 ER -