Scientific journal publication Cytochrome P450-mediated enzyme activities and polychlorinated biphenyl accumulation in harp seal (Phoca groenlandica). Wolkers, J.; Burkow, I C.; Monshouwer, M.; Lydersen, C.; Dahle, S.; Witkamp, R F. Publication details Journal: Mar. Environ. Res., 48, 59–72, 1999