MATHEMATICA SCANDINAVICA, vol. 103, no. 1, page. 97 - 110, 2008-05
MATHEMATISCHE NACHRICHTEN, vol. 281, no. 9, page. 1264 - 1272, 2008-09
STUDIA MATHEMATICA, vol. 178, no. 1, page. 63 - 82, 2007-03
QUARTERLY JOURNAL OF MATHEMATICS, vol. 59, page. 455 - 474, 2008-12
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