Primary productivity, differential size fraction and pigment composition responses in two Southern Ocean in situ iron enrichments, Lance, V. P.; Hiscock, M. R.; Hilting, A. K.; Stuebe, D. A.; Bidigare, R. R.; Smith, W. O.; Barber, R. T. , Deep-Sea Research Part I-Oceanographic Research Papers, May, Volume 54, Issue 5, p.747-773, (2007), DOI 10.1016/j.dsr.2007.02.008 Abstract