M. R. Garey Optimal Binary Search Trees with Restricted Maximal Depth. [Citation Graph (0, 0)][DBLP] SIAM J. Comput., 1974, v:3, n:2, pp:101-110 [Journal]
Volker Strassen Polynomials with Rational Coefficients Which Are Hard to Compute. [Citation Graph (0, 0)][DBLP] SIAM J. Comput., 1974, v:3, n:2, pp:128-149 [Journal]