Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Luc Houpert,An Engineering Approach to Hertzian Contact Elasticity—Part I,Journal of Tribology,0742-4787,ASME International,2000-07-10,123,3,582-588,https://cir.nii.ac.jp/crid/1362544420157793536,https://doi.org/10.1115/1.1308043