Hong, Yiming,. "On the nonexistence of perfect e-codes and tight 2e-designs in Hamming schemes H(n,q) with e > 3 and q > 3 /." Doctoral dissertation, Ohio State University, 1984. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487255963556229Chicago Manual of Style (17th edition)