@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},
     publisher = {Scuola normale superiore},
     volume = {Ser. 3, 23},
     number = {1},
     year = {1969},
     mrnumber = {273174},
     zbl = {0172.38002},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1969_3_23_1_87_0/}
}