Janse, M., B. Zimmerman, L. Geerlings, C. Brown, and L. A. Nagelkerke. “Sustainable Species Management of the Elasmobranch Populations Within European Aquariums: A Conservation Challenge”. Journal of Zoo and Aquarium Research, vol. 5, no. 4, Oct. 2017, pp. 172-81, doi:10.19227/jzar.v5i4.313.