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Alexander, J McKenzie, Balasubramanian, Rajalakshmi, Martin, Jeremy, Monahan, Kimberly, Pollatsek, Harriet and Sen, Ashna (2000) Ruling out (160, 54, 18) difference sets in some nonabelian groups. Journal of Combinatorial Designs, 8 (4). pp. 221-231. ISSN 1063-8539