Signed countings of types B and D permutations and t, q-Euler numbers. - Sen-Peng Eu; Tung-Shan Fu; Hsiang-Chun Hsu; Hsin-Chieh Liao (Adv. Appl. Math., 2018)

Signed mahonian identities on permutations with subsequence restrictions. - Sen-Peng Eu; Tung-Shan Fu; Hsiang-Chun Hsu; Hsin-Chieh Liao; Wei-Liang Sun (J. Comb. Theory A, 2020)