A phenomenological model of percolating magnetic nanostructures S. K. Wong, B. Zhao, T. K. Ng, X. N. Jing, X. Yan and P. M. Hui Eur. Phys. J. B, 10 3 (1999) 481-485 Published online: 15 August 1999 DOI: 10.1007/s100510050877