A comparison theorem for nonlinear operators

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1. M. Giovanna Platone Garroni, Teoremi di confronto "forte" per operatori differenziali ellittici del secondo ordine, non necessariamente autoaggiunti, a coefficienti discontinui. Nota I
2. M. Giovanna Platone Garroni, Teoremi di confronto "forte" per operatori differenziali ellittici del secondo ordine, non necessariamente autoaggiunti, a coefficienti discontinui. Nota II