no. 4
A general-weighted Sturm-Liouville problem
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 24 (1997) no. 4, pp. 767-782. 
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     title = {A general-weighted {Sturm-Liouville} problem},
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     pages = {767--782},
     publisher = {Scuola normale superiore},
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     zbl = {0913.34022},
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Constantin, Adrian. A general-weighted Sturm-Liouville problem. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 24 (1997) no. 4, pp. 767-782. http://archive.numdam.org/item/ASNSP_1997_4_24_4_767_0/

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