Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) OHGUSHI Kohji and HOMMA Kyoji and ICHIKAWA Masahiro and OKABE Nagatoshi and TAKAMATSU Tohru and MATSUMURA Takashi and ABE Yutaka,Strength Degradation in Ceramics by Sphere Indentation. Si3N4 Sphere Indentation of Si3N4 Specimen-Case of Elastic Condition.,TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A,03875008,The Japan Society of Mechanical Engineers,1997,63,606,392-398,https://cir.nii.ac.jp/crid/1390282679423979776,https://doi.org/10.1299/kikaia.63.392