On 021-Avoiding Ascent Sequences. - William Y. C. Chen; Alvin Y. L. Dai; Theodore Dokos; Tim Dwyer; Bruce E. Sagan (Electron. J. Comb., 2013)

Ordered partitions avoiding a permutation pattern of length 3. - William Y. C. Chen; Alvin Y. L. Dai; Robin D. P. Zhou (Eur. J. Comb., 2014)