Phonon effects and ESR in NH4CuCl3 S. Schmidt, S. Zherlitsyn, B. Wolf, H. Schwenk, B. Lüthi and H. Tanaka Europhys. Lett., 54 4 (2001) 554 Published online: 01 December 2003 DOI: 10.1209/epl/i2001-00282-0