Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Yukio Agatsuma,Population Dynamics of Edible Sea Urchins Associated with Variability of Seaweed Beds in Northern Japan,Aqua-bioscience monographs : ABSM,18823203,Tokyo : Terrapub,2014,7,2,47-78,https://cir.nii.ac.jp/crid/1521136280224913536,