We acknowledge a debt to the paper of Black [7].
This research was initiated when the first author was visiting the University of Alberta in the summer of 2008; the financial support and kind hospitality are gratefully acknowledged.
We also acknowledge useful discussions with J. Brown.
The author gratefully acknowledges the referee's helpful comments pertaining to the first draft of this paper.
[Do not write: “I acknowledge Dr. Brown for ......” if you mean: I wish to thank Dr. Brown for ......]
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