Das, K.; Holsbeek, L.; Browning, J.; Siebert, U.; Birkun, A.; Bouquegneau, J.-M. (2004). Trace metal and stable isotope measurements (δ13C and δ15N) in the harbour porpoise Phocoena phocoena relicta from the Black Sea. Environ. Pollut. 131(2): 197-204. dx.doi.org/10.1016/j.envpol.2004.02.006, more
Das, K.; Holsbeek, L.; Browning, J.; Siebert, U.; Birkun, A.; Bouquegneau, J.-M. (2004). Trace metal and stable isotope measurements (δ13C and δ15N) in the harbour porpoise Phocoena phocoena relicta from the Black Sea. Environ. Pollut. 131(2): 197-204.