W.Y.C. Chen and A.M. Fu
A context-free grammar for the e-positivity of the trivariate second-order Eulerian polynomials, Discrete Math. 345(1) (2022) 112661.

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  1. S.-M. Ma, J. Ma, Jean Yeh and Y.-N. Yeh, The e-positivity of multivariate k-order Eulerian polynomials, arXiv:2106.16189v1.

  2. S.-M. Ma, H. Qi, Jean Yeh and Y.-N. Yeh, Stirling permutation codes, arXiv:2210.11372.