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.

Voir la notice de l'article provenant de la source Biblioteca Digitale Italiana di Matematica

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. 
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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. https://geodesic-test.mathdoc.fr/item/RLINA_1975_8_59_6_a0/

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