Vezzulli, Luigi, Paolo Povero, and Mauro Fabiano. 2002. “The Distribution and Biochemical Composition of Biogenic Particles across the Subtropical Front in June 1993 (Azores-Madeira Region, Northeast Atlantic)”. Scientia Marina 66 (3):205-14. https://doi.org/10.3989/scimar.2002.66n3205.