Tseng-Kuei Li Jimmy J. M. Tan Lih-Hsing Hsu Ting-Yi Sung The shuffle-cubes and their generalization. 35-41 2001 77 Inf. Process. Lett. 1 db/journals/ipl/ipl77.html#LiTHS01 http://dx.doi.org/10.1016/S0020-0190(00)00147-2