@article{BUMI_2005_8_8B_1_a12,
     author = {Ricciardi, Tonia},
     title = {A sharp weighted {Wirtinger} inequality},
     journal = {Bollettino della Unione matematica italiana},
     pages = {259--267},
     publisher = {mathdoc},
     volume = {Ser. 8, 8B},
     number = {1},
     year = {2005},
     zbl = {1177.26026},
     mrnumber = {97478},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/BUMI_2005_8_8B_1_a12/}
}