Progress in Flaw Growth and Fracture Toughness Testing : Proceedings of the 1972National Symposium on Fracture Mechanics : A Symposium Presented by Committee E-24 on Fracture Testing of Metals,American Society for Testing and Materials Philadelphia,Pa.,28-30 Aug.1972 : ASTM STP No.536 STP 536 - ASTM (American Society for Testing and Materials (ASTM), 1973)