On the $e$-Positivity of $(claw, 2K_2)$-Free Graphs. - Grace M. X. Li; Arthur L. B. Yang (Electron. J. Comb., 2021)

A planar network proof for Hankel total positivity of type B Narayana polynomials. - Ethan Y. H. Li; Grace M. X. Li; Arthur L. B. Yang; Candice X. T. Zhang (Adv. Appl. Math., 2022)