@article{10_37236_1193,
     author = {Donald E. Knuth},
     title = {The sandwich theorem},
     journal = {The electronic journal of combinatorics},
     year = {1994},
     volume = {1},
     doi = {10.37236/1193},
     zbl = {0810.05065},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/1193/}
}