DEL MONTE M, NANNI T, TAGLIAZUCCA M. The origin of black magnetic spherules through a study of their chemical, physical and mineralogieal characteristics. Ann. Geophys. [Internet]. 1976Nov.25 [cited 2024Apr.20];29(1-2):9-25. Available from: https://www.annalsofgeophysics.eu/index.php/annals/article/view/4789