Size and doping effects on the magnetic and electric properties of BiFeO nanoparticles Iliana N. Apostolova, Angel T. Apostolov and Julia M. Wesselinowa Eur. Phys. J. B, 96 6 (2023) 77 Published online: 13 June 2023 DOI: 10.1140/epjb/s10051-023-00550-x