Ríos, A. F., Fraga, F., Pérez, F. F., & Figueiras, F. G. (1998). Chemical composition of phytoplankton and Particulate Organic Matter in the Ría de Vigo (NW Spain). Scientia Marina, 62(3), 257–271. https://doi.org/10.3989/scimar.1998.62n3257