Individual-collective crossover driven by particle size in dense assemblies of superparamagnetic nanoparticlesKarl Ridier, Béatrice Gillon, Grégory Chaboussant, Laure Catala, Sandra Mazérat, Eric Rivière and Talal MallahEur. Phys. J. B, 90 4 (2017) 77DOI: https://doi.org/10.1140/epjb/e2017-70534-9