Desportes, G., Pike, D., Gunnlaugsson, T., Mikkelsen, B., Lawson, J., Simon, M., Víkingsson, G., Witting, L., Øien, N., Zabavnikov, V. and Acquarone, M. Trans North Atlantic Sightings Survey – TNASS 2007. IWC/SC/59/O19. Udgivet 12.03.2019
Desportes, G., Pike, D., Gunnlaugsson, T., Mikkelsen, B., Lawson, J., Simon, M., Víkingsson, G., Witting, L., Øien, N., Zabavnikov, V. and Acquarone, M. Trans North Atlantic Sightings Survey – TNASS 2007. IWC/SC/59/O19.
