On the Two-Stage Iterative Method of Douglas for Mildly Nonlinear Elliptic Difference Equations. J.E. GUNN — 1964 Numerische Mathematik
The Numerical Solution of V Â? a Vu=f by a Semi-Explicit Alternating-Direction Iterative Technique. J.E. GUNN — 1964 Numerische Mathematik
A General Formulation of Alternating Direction Methods. Part I. Parabolic and Hyperbolic Problems. J. jr. DOUGLAS; J.E. GUNN — 1964 Numerische Mathematik