G. Garuti, P. Alfonso, J. A. Proenza, and F. Zaccarini, “SULFUR-ISOTOPE VARIATIONS IN SULFIDE MINERALS FROM MASSIVE SULFIDE DEPOSITS OF THE NORTHERN APENNINE OPHIOLITES: INORGANIC AND BIOGENIC CONSTRAINTS”, Ofioliti, vol. 34, no. 1, pp. 43-62, Mar. 2009.