title = {The construction of Huffman codes is a submodular (``convex'') optimization problem over a lattice of binary trees},
author = {D. Stott Parker Jr. and Prasad Ram},
journal = {SIAM J. Computing},
publisher = {SIAM},
volume = {28},
number = {5},
pages = {1875--1905},
year = {1999}}

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