@article{RLIN_1996_9_7_1_a4,
     author = {Valent, Tullio},
     title = {An abstract setting for boundary problems with affine symmetries},
     journal = {Atti della Accademia nazionale dei Lincei. Rendiconti Lincei. Matematica e applicazioni},
     pages = {47--58},
     publisher = {mathdoc},
     volume = {Ser. 9, 7},
     number = {1},
     year = {1996},
     zbl = {0871.47043},
     mrnumber = {448362},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RLIN_1996_9_7_1_a4/}
}