Lista de

Landesman-Lazer conditions
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"Two classical periodic problems on time scales" (2007) Amster, P.; Tisdell, C.C. Electronic Journal of Differential Equations. 2007:1-12
"Landesman-Lazer type conditions for a system of p-Laplacian like operators" (2007) Amster, P.; De Nápoli, P. Journal of Mathematical Analysis and Applications. 326(2):1236-1243