Heavy electron YbNi2B2C and giant exchange YbNiBC: 170Yb Mössbauer spectroscopy and magnetization studies P. Bonville, J. A. Hodges, Z. Hossain, R. Nagarajan, S. K. Dhar, L. C. Gupta, E. Alleno and C. Godart Eur. Phys. J. B, 11 3 (1999) 377-383 Published online: 15 October 1999 DOI: 10.1007/s100510050948