The sandwich theorem.
Knuth, Donald E.
The Electronic Journal of Combinatorics [electronic only], Tome 1 (1994), / Harvested from The Electronic Library of Mathematics
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Publié le : 1994-01-01
EUDML-ID : urn:eudml:doc:118559 
@article{00721219,
     title = {The sandwich theorem.},
     journal = {The Electronic Journal of Combinatorics [electronic only]},
     volume = {1},
     year = {1994},
     zbl = {0810.05065},
     language = {en},
     url = {http://dml.mathdoc.fr/item/00721219}
}

Knuth, Donald E. The sandwich theorem.. The Electronic Journal of Combinatorics [electronic only], Tome 1 (1994) . http://gdmltest.u-ga.fr/item/00721219/