A dynamic programming approach to sequencing problemsMichael HeldRichard M. Karp1961ACM National Meeting 1961
An experimental program for the selection of "disjunctive hypotheses"Manfred Kochen1961Western IRE-AIEE-ACM 1961
Optimum Nonlinear Filters for Quantized InputsF. TungR.J. Schwarz1961IRE Transactions on Information Theory