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In this paper we show that the Lp-realizationof a vector-valuedelliptic boundary value problem (A;Bj) admits a bounded H-calculus on Lp(G;E), 1 < p < 1, provided the top-order coe cients of A are Holder continuous. Here G denotes a domain in R with compact C2m-boundary and E a Banach space of class HT . Our proof is based on an abstract perturbation result(More)
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