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23/10 2009  submitted
4/11 2009   with editor
20/11 2009 under review
1/2 2010  required reviewers completed
4/2 2010  decision in process
4/2 2010 major revision
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Reviewer #1:  By using a special binary function Beta, the paper defines a pair of approximation operators in the fuzzy environment. Some basic properties of the operators are examined, which are similar to those of the existing fuzzy approximation operators. For two different kinds of approximation operators, the paper introduces two roughness measures and discusses a property.
The main difference of the definition of the proposed approximation operators from the original one is the Beta function. But, the authors do not explain why they use this function, and I wonder the advantage of the use of Beta operator.
Since the idea, results and proofs are parallel to the literature, this simple extension is not worth being published if there is no a good explanation.

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Reviewer #2: The idea of submitted paper is very interesting. The article is well written. The results obtained seem significant.

However, there exist in the paper some errors and mistakes:

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