1. Foundations of Potential Theory;Kellogg,1953
2. Theoretical Mechanics, The Theory of the Potential;MacMillan,1930
3. Potential Theory and its Applications to Basic Problems of Mathematical Physics;Gunter,1967
4. Partial Differential Equations of Mathematical Physics;Sobolev,1964
5. Integral Equation Methods in Scattering Theory;Colton,1983