Anomalous photoacoustic effect from pulsed excitation of Eu 3+ ions S.M. Park, P.J. Chong, T.H. Yoon, H. Moon et J.G. Choi J. Phys. IV France, 04 C7 (1994) C7-421-C7-424 DOI: 10.1051/jp4:1994799