Discrete fractional fourier transform matrix

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I am trying to write a matlab code for some calculations based on Discrete fractional fourier transform. in this article: Optimal filtering in fractional Fourier. after equation (7) a notation Fa is fractional fourier transform matrix, notation a is order of transform and when a=1 the matrix will be equal to simple DFT matrix. my question is that how can i make this matrix in matlab? what is the elements of this matrix? here: Review of Computing Algorithms for Discrete Fractional Fourier Transform in equation (5) is a explanation about it but there is still some unknown notations for me .. I searched too much but i didn't get the answer ... thanks in advance.