A bijective enumeration of tiered trees. - Sherry H. F. Yan; Danna Yan; Hao Zhou (Discret. Math., 2020)

Self-conjugate (s, s+d, s+2d)-core partitions and free Motzkin paths. - Sherry H. F. Yan; Danna Yan; Hao Zhou (Discret. Math., 2021)