@article{10_37236_2472,
     author = {William Y.C. Chen and Alvin Y.L. Dai and Theodore Dokos and Tim Dwyer and Bruce E. Sagan},
     title = {On 021-avoiding ascent sequences},
     journal = {The electronic journal of combinatorics},
     year = {2013},
     volume = {20},
     number = {1},
     doi = {10.37236/2472},
     zbl = {1267.05006},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/2472/}
}