Deepak Venkateshvaran, Wolfgang Kaiser, Andrea Boger, Matthias Althammer, M. S. Ramachandra Rao, Sebastian T. B. Goennenwein, Matthias Opel, Rudolf Gross: Anomalous Hall effect in magnetite: Universal scaling relation between Hall and longitudinal conductivity in low-conductivity ferromagnets. 2008Physical Review B: 78. ISBN 1098-0121 http://dx.doi.org/10.1103/PhysRevB.78.092405