"K. Goto,T. Osakabe,K. Kakurai,Y. Uwatoko,A. Oosawa,J. Kawakami,H. Tanaka","Softening of Magnetic Excitations Leading to Pressure-Induced Quantum Phase Transition in Gapped Spin System KCuCl3",,"J. Phys. Soc. Jpn.",,"Vol. 76",,"pp. 053704 (1-4)",2007,