no. 2
Completely monotone families of solutions of n-th order linear differential equations and infinitely divisible distributions
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 3 (1976) no. 2, pp. 267-287.
corrigé par Errata-Corrige : “Completely monotone families of solutions of n-th order linear differential equations and infinitely divisible distributions” 
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     title = {Completely monotone families of solutions of $n$-th order linear differential equations and infinitely divisible distributions},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
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     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 3},
     number = {2},
     year = {1976},
     mrnumber = {404760},
     zbl = {0386.34016},
     language = {en},
     url = {http://archive.numdam.org/item/ASNSP_1976_4_3_2_267_0/}
}
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Hartman, Philip. Completely monotone families of solutions of $n$-th order linear differential equations and infinitely divisible distributions. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 3 (1976) no. 2, pp. 267-287. http://archive.numdam.org/item/ASNSP_1976_4_3_2_267_0/

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