TY - BOOK ID - 138590285 TI - The excitation spectrum for a bose gas with repulsive and attractive interactions AU - Brown, Gerald V. AU - United States. AU - Lewis Research Center. PY - 1968 PB - Washington, D.C. : National Aeronautics and Space Administration, DB - UniCat KW - Spectrum analysis. UR - https://www.unicat.be/uniCat?func=search&query=sysid:138590285 AB - ER -