Hadamard operations on rational functions
Groupe de travail d'analyse ultramétrique, Volume 10 (1982-1983) no. 1, Talk no. 4, 11 p. 
@article{GAU_1982-1983__10_1_A3_0,
     author = {van der Poorten, Alferd J.},
     title = {Hadamard operations on rational functions},
     journal = {Groupe de travail d'analyse ultram\'etrique},
     publisher = {Secr\'etariat math\'ematique},
     volume = {10},
     number = {1},
     year = {1982-1983},
     note = {talk:4},
     zbl = {0543.10006},
     language = {en},
     url = {http://www.numdam.org/item/GAU_1982-1983__10_1_A3_0}
}

Van der Poorten, Alfred J. Hadamard operations on rational functions. Groupe de travail d'analyse ultramétrique, Volume 10 (1982-1983) no. 1, Talk no. 4, 11 p. http://www.numdam.org/item/GAU_1982-1983__10_1_A3_0/

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