@article{PORMA_1999__56_2_48443,
     author = {Duverney, D.},
     title = {Linear approximation forms and irrationality of values of -functions. {(Formes} lin\'eaires d'approximation et irrationalit\'e de valeurs de -fonctions.)},
     journal = {Portugaliae mathematica},
     pages = {205--220},
     publisher = {mathdoc},
     volume = {56},
     number = {2},
     year = {1999},
     zbl = {0939.11026},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1999__56_2_48443/}
}