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D. A. Hills et aliii, Frattura ed Integrità Strutturale, 25 (2013) 27-35; DOI: 10.3221/IGF-ESIS.25.05 35 R EFERENCES [1] Hills, D.A., Dini, D., Characteristics of the Process Zone at Sharp Notch Roots, Int. J. Solid Struct., 48 (2011), 2177– 2183. [2] Williams, M. L., Stress singularities resulting from various boundary conditions in angular plates in extension. J. Appl. Mech., 19 (1952), 526–528.