Permutations which avoid 1243 and 2143, continued fractions, and Chebyshev polynomials.
Egge, Eric S. ; Mansour, Toufik
The Electronic Journal of Combinatorics [electronic only], Tome 9 (2003), / Harvested from The Electronic Library of Mathematics
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Publié le : 2003-01-01
EUDML-ID : urn:eudml:doc:122838 
@article{01861459,
     title = {Permutations which avoid 1243 and 2143, continued fractions, and Chebyshev polynomials.},
     journal = {The Electronic Journal of Combinatorics [electronic only]},
     volume = {9},
     year = {2003},
     zbl = {1020.05003},
     language = {en},
     url = {http://dml.mathdoc.fr/item/01861459}
}

Egge, Eric S.; Mansour, Toufik. Permutations which avoid 1243 and 2143, continued fractions, and Chebyshev polynomials.. The Electronic Journal of Combinatorics [electronic only], Tome 9 (2003) . http://gdmltest.u-ga.fr/item/01861459/