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It is well that GGA/LDA underestimate energy band gap severely according the calculated band structure/dos/optical properties are not proper. Authors has not suggested any way to get out from this problem.
All these calculation have been performed with primitive cell which consist 2 atoms.
I suggest that authors must perform excited state calculation to find more reliable electronic and optical properties of the given materials. It also suggested that such kind of excited calculation has been also done which has not been cited by the authors.
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