@article{oai:tohoku-gakuin.repo.nii.ac.jp:00000206,
 author = {熊谷, 正朗},
 issue = {9},
 journal = {プラントエンジニア},
 month = {Sep},
 pages = {74--75},
 title = {「円周率は3 」と有効数字},
 volume = {45},
 year = {2013},
 yomi = {クマガイ, マサアキ}
}