@article{10_37236_1679,
     author = {Eric S. Egge and Toufik Mansour},
     title = {Permutations which avoid 1243 and 2143, continued fractions, and {Chebyshev} polynomials},
     journal = {The electronic journal of combinatorics},
     year = {2002},
     volume = {9},
     number = {2},
     doi = {10.37236/1679},
     zbl = {1020.05003},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/1679/}
}