J. S. Wu, C. F. Yang, H. Z. Shu, L. Wang, L. Senhadji. A fast algorithm for the 4x4 discrete Krawtchouk transform. Wan, Y and Shao, L and Wang, L and Sun, J and Nan, J and Zhang, Q. CRC PRESS-TAYLOR & FRANCIS GROUP, pp.23--28, 2015, 978-1-315-68858-9; 978-1-138-02785-5.
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