@article{RLINA_1971_8_50_6_a1,
     author = {Dunninger, D. R.},
     title = {A {Picone} integral identity for a class of fourth order elliptic differential inequalities},
     journal = {Atti della Accademia nazionale dei Lincei. Rendiconti della Classe di scienze fisiche, matematiche e naturali},
     pages = {630--641},
     publisher = {mathdoc},
     volume = {Ser. 8, 50},
     number = {6},
     year = {1971},
     zbl = {0249.35023},
     mrnumber = {0312039},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RLINA_1971_8_50_6_a1/}
}