Application of the method of the kernel function for solving boundary-value problems. S. BERGMAN; J.G. HERRIOT — 1961 Numerische Mathematik
Numerical Solution of Boundary-Value Problems by the Method of Integral Operators. S. BERGMAN; J.G. HERRIOT — 1965 Numerische Mathematik
Computation of a Class of Subsonic Flow Patterns. S. BERGMAN; J.G. HERRIOT — 1971 Numerische Mathematik