Electron paramagnetic resonance in the quasi-two dimensional magnetic ludwigite Fe3O2BO3 J. Dumas, J.L. Tholence, M. Continentino, J.C. Fernandes, R.B. Guimaraes et M.H. Whangbo J. Phys. IV France, 12 9 (2002) 351-354 DOI: 10.1051/jp4:20020435