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Published online by Cambridge University Press: 26 February 2010
An oversight by the typesetters has led to the omission of the summation condition on the second summation of the first displayed equation on page 392 of [1]. The proof of Lemma 4.1 is consequently very difficult to follow. The expression for Ip(α) should read
In addition, we take this opportunity to note that on page 391, in the two displayed equations following equation (3.15), the summations involving ud+1 should read