W.Y.C. Chen and A.M. Fu
A Context-free Grammar for the e-Positivity of the Trivariate Second-order Eulerian Polynomials, arXiv:2106.08831.

Cited by

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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.