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TY - CONF AU - Dahmen, Wolfgang TI - Trigonometric approximation with exponential error orders. III. Criteria for asymptotically optimal processes CY - Gdansk M1 - RWTH-CONV-196267 PY - 1979 LB - PUB:(DE-HGF)8 UR - https://publications.rwth-aachen.de/record/125825 ER -