Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI)
齋藤 三郎,Differential Coefficients at Corners and Division by Zero Calculus,viXra.org https://vixra.org/abs/2108.0165,,,2021,viXra,,,https://cir.nii.ac.jp/crid/1010294643650924811,