Manjhi, Pankaj Kumar. “Method of Construction and Some Properties of 4-Row-Regular Circulant Partial Hadamard Matrices of Order \((k\times 2k)\)”. Communications in Mathematics and Applications 13, no. 2 (August 17, 2022): 613–623. Accessed June 16, 2025. http://www.journals.rgnpublications.com/index.php/cma/article/view/1905.