Geodesic
Strong oscillation of elliptic systems of second order partial differential equations
Atti della Accademia nazionale dei Lincei. Rendiconti della Classe di scienze fisiche, matematiche e naturali, Série 8, Tome 59 (1975) no. 6, pp. 595-602

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Si dà una condizione sufficiente ad assicurare il carattere fortemente oscillatorio dei sistemi ellittici del tipo $$\sum_{i,j=1}^{n} \, D_{i}(A_{ij}(x) \, D_{j}u) + C(x) \, u = 0.$$ Con questo risultato si estendono vari criteri noti relativi al caso di una sola equazione. 
Rankin, Samuel M. Strong oscillation of elliptic systems of second order partial differential equations. Atti della Accademia nazionale dei Lincei. Rendiconti della Classe di scienze fisiche, matematiche e naturali, Série 8, Tome 59 (1975) no. 6, pp. 595-602. http://geodesic.mathdoc.fr/item/RLINA_1975_8_59_6_a0/
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