no. 1
Linear Goursat problems for entire functions when the coefficients are variable
Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche, Série 3, Tome 23 (1969) no. 1, pp. 87-98 
@article{ASNSP_1969_3_23_1_87_0,
     author = {Persson, Jan},
     title = {Linear {Goursat} problems for entire functions when the coefficients are variable},
     journal = {Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche},
     pages = {87--98},
     year = {1969},
     publisher = {Scuola normale superiore},
     volume = {Ser. 3, 23},
     number = {1},
     mrnumber = {273174},
     zbl = {0172.38002},
     language = {en},
     url = {https://www.numdam.org/item/ASNSP_1969_3_23_1_87_0/}
}
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Persson, Jan. Linear Goursat problems for entire functions when the coefficients are variable. Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche, Série 3, Tome 23 (1969) no. 1, pp. 87-98. https://www.numdam.org/item/ASNSP_1969_3_23_1_87_0/

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