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There is a complete discussion of this question, in general dimensions (as well as other thingsit is true there too), in my thesis, published in Duke Math J. 1985.
There is a complete discussion of this question (as well as other things) in my thesis, published in Duke Math J. 1985.
There is a complete discussion of this question, in general dimensions (it is true there too), in my thesis, published in Duke Math J. 1985.