TY - JOUR AU - P.G. CIARLET AU - R.S. VARGA AU - M.H. SCHULTZ TI - Numerical Methods of High-Order Accuracy for Nonlinear Boundary Value Problems. IV. Periodic Boundary Conditions. JO - Numerische Mathematik PY - 1968 SP - 266 EP - 279 VL - 12 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/NUMA_1968__12_131873/ ID - NUMA_1968__12_131873 ER -