Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Mizota Chitoshi and Sasaki Minami and Yamanaka Toshiro,Temporal variation in the concentration and nitrogen isotopic ratios of inorganic nitrogen from soils under Cormorant and Heron colonies.,Japanese Journal of Ornithology,0913-400X,The Ornithological Society of Japan,2007,56,2,115-130,https://cir.nii.ac.jp/crid/1390001204482324480,https://doi.org/10.2326/jjo.56.115