Celebratio Mathematica

R. As­key, M. E. H. Is­mail, and T. M. T. Rashed: “A de­range­ment prob­lem (ab­stract),” pp. 639–​641 in Pro­ceed­ings of the sixth south­east­ern con­fer­ence on com­bin­at­or­ics, graph the­ory, and com­pu­ta­tion (Boca Raton, FL, 17–20 Feb­ru­ary 1975), vol. 14. Edi­ted by F. Hoff­man, R. C. Mul­lin, R. B. Levow, D. Roselle, R. G. Stan­ton, and R. S. D. Thomas. Con­gres­sus Nu­m­er­an­ti­um. Util­it­as Math­em­at­ica (Win­nipeg), 1975. Also pub­lished as a 1975 tech­nic­al re­port. Zbl 0337.​05011 incollection