著者名,論文名,雑誌名,ISSN,出版者名,出版日付,巻,号,ページ,URL,URL(DOI) Joseph B. Kruskal,On the Shortest Spanning Subtree of a Graph and the Traveling Salesman Problem,Proceedings of the American Mathematical Society,0002-9939,JSTOR,1956-02,7,1,48,https://cir.nii.ac.jp/crid/1361981471212410240,https://doi.org/10.2307/2033241