1. Alaska Sea Grant Marine Advisory Program 2010 Sea urchin markets https://seagrant.uaf.edu/map/marketing/seaurchinroe.php
2. In Japan, searching for prized sea urchins;Belson;New York Times,2013
3. Occurrence and metabolism of anandamide and related acyl-ethanolamides in ovaries of the sea urchin Paracentrotus lividus;Bisogno;Biochimicaet Biophysica Acta,1997