Magnetic measurement and a crystal field investigation of Ho2(SO4)3.8H2O crystal R. Gupta, S. Biswas, U. S. Ghosh and C. Basu Eur. Phys. J. B, 10 4 (1999) 635-640 Published online: 15 August 1999 DOI: 10.1007/s100510050895