Garuti, Giorgio, et al. “SULFUR-ISOTOPE VARIATIONS IN SULFIDE MINERALS FROM MASSIVE SULFIDE DEPOSITS OF THE NORTHERN APENNINE OPHIOLITES: INORGANIC AND BIOGENIC CONSTRAINTS”. Ofioliti, vol. 34, no. 1, Mar. 2009, pp. 43-62, doi:10.4454/ofioliti.v34i1.377.