@article{10_37236_1761,
     author = {Abraham Flaxman and Aram W. Harrow and Gregory B. Sorkin},
     title = {Strings with maximally many distinct subsequences and substrings},
     journal = {The electronic journal of combinatorics},
     year = {2004},
     volume = {11},
     number = {1},
     doi = {10.37236/1761},
     zbl = {1034.68067},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/1761/}
}