Vanden Berghe, M.; Mat, A.; Arriola, A.; Polain, S.; Stekke, V.; Thomé, J.-P.; Gaspart, F.; Pomeroy, P.; Larondelle, Y.; Debier, C. (2010). Relationships between vitamin A and PCBs in grey seal mothers and pups during lactation. Environ. Pollut. 158(5): 1570-1575. http://dx.doi.org/10.1016/j.envpol.2009.12.012, meer