1. P. Grisvard, Singularities in Boundary Value Problems (Masson, Paris, 1992).
2. N. F. Morozov, Mathematical Aspects of Crack Theory (Nauka, Moscow, 1984) [in Russian].
3. E. I. Shifrin, Three-Dimensional Problems in Linear Fracture Mechanics (Fizmatlit, Moscow, 2002) [in Russian].
4. A. M. Khludnev and V. A. Kovtunenko, Analysis of Cracks in Solids (WIT, Southampton, 2000).
5. A. M. Khludnev, Elasticity Problems in Nonsmooth Domains (Fizmatlit, Moscow, 2010) [in Russian].