Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) 道工 勇,The Spectrum of Second Order Elliptic Operator and Useful Integral Inequality<数学・自然科学>,埼玉大学紀要. 教育学部 = Journal of Saitama University. Faculty of Education,1881-5146,埼玉大学教育学部,2019,68,2,495-505,https://cir.nii.ac.jp/crid/1390853649745144704,https://doi.org/10.24561/00018729