Journal of Petrochemical Universities
Critical Load and Cracking Angle for Flat Indentation  
XIE Yu-jun, WANG Wei, WANG Xiao-hua, CAI Yong-mei
Journal of Petrochemical Universities . 2010, (3): 68 -71 .  DOI: 10.3696/j.issn.1006-396X.2010.03.016