Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) SHIONO Kiyoji,Mathematical Basis for Classification of Sedimentary Layers under the Law of Superposition,Geoinformatics,0388502X,Japan Society of Geoinformatics,1999,10,4,213-223,https://cir.nii.ac.jp/crid/1390282679415734912,https://doi.org/10.6010/geoinformatics1990.10.4_213