Pichegru, L., Ryan, P.G., Le Bohec, C., van der Lingen, C.D., Navarro, R., Petersen, S., Lewis, S., van der Westhuizen, J., Grémillet, D., "Overlap between vulnerable top predators and fisheries in the Benguela upwelling system: implications for marine protected areas", Marine Ecology Progress Series, 2009