@article{10_37236_2003,
     author = {Dominique Foata and Guo-Niu Han},
     title = {The \((t,q)\)-analogs of secant and tangent numbers},
     journal = {The electronic journal of combinatorics},
     year = {2011},
     volume = {18},
     number = {2},
     doi = {10.37236/2003},
     zbl = {1233.05041},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/2003/}
}