Chien-Ping Chang Ting-Yi Sung Lih-Hsing Hsu Edge Congestion and Topological Properties of Crossed Cubes. 64-80 2000 11 IEEE Trans. Parallel Distrib. Syst. 1 http://www.computer.org/tpds/td2000/l0064abs.htm db/journals/tpds/tpds11.html#ChangSH00