Why could electron spin resonance be observed in a heavy fermion Kondo lattice?B. I. Kochelaev, S. I. Belov, A. M. Skvortsova, A. S. Kutuzov, J. Sichelschmidt, J. Wykhoff, C. Geibel and F. SteglichEur. Phys. J. B, 72 4 (2009) 485-489DOI: https://doi.org/10.1140/epjb/e2009-00386-9