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    Square roots of doubly regular tournament matrices
    (International Linear Algebra Society, 2014) Hacioglu, Ilhan; Michael, T.S.; Ozdemir, Serhat
    Fletcher asked whether there is a (0, 1)-matrix of order greater than 3 whose square is a regular tournament matrix. We give a negative answer for a special class of regular tourna- ment matrices: There is no (0, 1)-matrix of order greater than 3 whose square is a doubly regular tournament matrix. © 2015, Electronic Journal of Linear Algebra. All rights reserved.