@article{BUMI_2013_9_6_3_a14, author = {D'Agu{\`\i}, Giuseppina}, title = {Molteplicity of {Solutions} for {Sturm-Liouville} {Problems}}, journal = {Bollettino della Unione matematica italiana}, pages = {725--734}, publisher = {mathdoc}, volume = {Ser. 9, 6}, number = {3}, year = {2013}, zbl = {1149.49007}, mrnumber = {3202850}, language = {en}, url = {http://geodesic.mathdoc.fr/item/BUMI_2013_9_6_3_a14/} }