Effective magnetic properties of a composite material with circular conductive elements M. Gorkunov, M. Lapine, E. Shamonina and K. H. Ringhofer Eur. Phys. J. B, 28 3 (2002) 263-269 Published online: 31 July 2002 DOI: 10.1140/epjb/e2002-00228-4