Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Hano M.,Finite‐element solution of three‐dimensional resonator problems—Novel tetrahedral element,I.E.I.C.E. Trans. (C),,,1988,71,3,333,https://cir.nii.ac.jp/crid/1370298338840444547,