Shingo Hasegawa Shuji Isobe Hiroki Shizuya NPMV-Complete Functions That Compute Discrete Logarithms and Integer Factorization. 342-344 2008 91-A IEICE Transactions 1 http://dx.doi.org/10.1093/ietfec/e91-a.1.342 db/journals/ieicet/ieicet91a.html#HasegawaIS08