S.  Vijayanand, Mahajan, M. B., Potdar, H. S., and Joy, P. Alias, ?Magnetic characteristics of nanocrystalline multiferroic BiFeO3 at low temperatures?, Physical Review B, vol. 80, no. 6, p. 064423, 2009.

M. V.  Limaye, ?Magnetic studies of SiO2 coated CoFe2O4 nanoparticles?, Journal of Magnetism and Magnetic Materials, vol. 441, pp.  683-690, 2017.