@article {fonda2011nonlinear,
	title = {Nonlinear resonance: a comparison between Landesman-Lazer and Ahmad-Lazer-Paul conditions},
	journal = {Advanced Nonlinear Studies},
	volume = {11},
	number = {2},
	year = {2011},
	pages = {391{\textendash}404},
	publisher = {Advanced Nonlinear Studies, Inc.},
	abstract = {<p>We show that the Ahmad-Lazer-Paul condition for resonant problems is more general than the Landesman-Lazer one, discussing some relations with other existence conditions, as well. As a consequence, such a relation holds, for example, when considering resonant boundary value problems associated with linear elliptic operators, the p-Laplacian and, in the scalar case, with an asymmetric oscillator.</p>},
	doi = {10.1515/ans-2011-0209},
	author = {Alessandro Fonda and Maurizio Garrione}
}
