1. Popov, G.Y. (1982) Contact Problems for a Linearly Deformable Foundation. Odessa, Kiev.
2. Tricomi, F.G. (1985) Integral Equations. Dover, New York.
3. Hochastadt, H. (1973) Integral Equations. Publisher, New York.
4. Green, C.D. (1969) Integral Equation Methods. Nelson, New York.
5. Athkinson, K.E. (1976) A Survey of Numerical Methods for the Solution of Fredholm Integral Equations of the Second Kind. SIAM, Philadelphia.