@article{10_37236_4624,
     author = {Ira M. Gessel and Yan Zhuang},
     title = {Counting permutations by alternating descents},
     journal = {The electronic journal of combinatorics},
     year = {2014},
     volume = {21},
     number = {4},
     doi = {10.37236/4624},
     zbl = {1302.05007},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/4624/}
}