Kharaghani, H.; Tayfeh-Rezaie, B. (2005). "A Hadamard matrix of order 428". Journal of Combinatorial Designs. 13 (6): 435–440. doi:10.1002/jcd.20043. S2CID17206302.
Đoković, Dragomir Ž; Golubitsky, Oleg; Kotsireas, Ilias S. (2014). "Some new orders of Hadamard and Skew-Hadamard matrices". Journal of Combinatorial Designs. 22 (6): 270–277. arXiv:1301.3671. doi:10.1002/jcd.21358. S2CID26598685.
Kharaghani, H.; Tayfeh-Rezaie, B. (2005). "A Hadamard matrix of order 428". Journal of Combinatorial Designs. 13 (6): 435–440. doi:10.1002/jcd.20043. S2CID17206302.
Đoković, Dragomir Ž; Golubitsky, Oleg; Kotsireas, Ilias S. (2014). "Some new orders of Hadamard and Skew-Hadamard matrices". Journal of Combinatorial Designs. 22 (6): 270–277. arXiv:1301.3671. doi:10.1002/jcd.21358. S2CID26598685.