Sousa, R., Henriques, P., Biscoito, M., Pinto, A.R., Delgado, J., Dellinger, T., Gouveia, L., Pinho, M.R. 2014. Considerations on the Biology of Plesionika narval (Fabricius, 1787) in the Northeastern Atlantic. Turkish Journal of Fisheries and Aquatic Sciences, 14: 727-737. doi: 10.4194/1303-2712-v14_3_15