TY - JOUR AU - Hans-Peter Helfrich TI - Error Estimates for Semidiscrete Galerkin Type Approximations for Semilinear Evolution Equations with Nonsmooth Initial Data. JO - Numerische Mathematik PY - 1987 SP - 559 EP - 570 VL - 51 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/NUMA_1987__51_133213/ ID - NUMA_1987__51_133213 ER -