Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) J.J. Van Loef and P.J.M. Franssen,The Mössbauer effect in the hexagonal ferrite BaO.6Fe2O3,Physics Letters,0031-9163,Elsevier BV,1963-12,7,4,225-226,https://cir.nii.ac.jp/crid/1363670318198136064,https://doi.org/10.1016/0031-9163(63)90304-4