Bilinear generating functions for Laguerre and Lauricella polynomials in several variables
Rendiconti del Seminario Matematico della Università di Padova, Tome 43 (1970), pp. 269-276 
@article{RSMUP_1970__43__269_0,
     author = {Carlitz, L.},
     title = {Bilinear generating functions for {Laguerre} and {Lauricella} polynomials in several variables},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {269--276},
     year = {1970},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {43},
     mrnumber = {274823},
     zbl = {0235.33014},
     language = {en},
     url = {https://www.numdam.org/item/RSMUP_1970__43__269_0/}
}
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Carlitz, L. Bilinear generating functions for Laguerre and Lauricella polynomials in several variables. Rendiconti del Seminario Matematico della Università di Padova, Tome 43 (1970), pp. 269-276. https://www.numdam.org/item/RSMUP_1970__43__269_0/

[1] Erdélyi, A.: Beitrag zur Theorie der konfluenten hypergeometrischen Funktionen von mehreren Veränderlichen, Akademie der Wissenschaften in Wien, Sitzungsberichte, Abt. IIa, Math.-Nat. Klasse, vol. 146 (1937), pp. 431-467. | Zbl

[2] Szegö, G.: Orthogonale Polynomials, New York, 1939.

[3] Weisner, L.: Group-theoretic origin of certain generating functions, Pacific Journal of Mathematics, vol. 5 (1955), pp. 1033-1039. | Zbl | MR