Shyue-Ming Tang Yue-Li Wang Yung-Ho Leu Optimal Independent Spanning Trees on Hypercubes. 143-156 2004 20 J. Inf. Sci. Eng. 1 http://www.iis.sinica.edu.tw/page/jise/2004/200401_08.html db/journals/jise/jise20.html#TangWL04