RT Journal Article SR Electronic T1 The strain elipsoid as a theory of rupture JF American Journal of Science JO Am J Sci FD American Journal of Science SP 121 OP 137 DO 10.2475/ajs.s5-30.176.121 VO s5-30 IS 176 A1 David Tressell Griggs YR 1935 UL http://www.ajsonline.org/content/s5-30/176/121.abstract AB