@article {2021,
	title = {Non-well-ordered lower and upper solutions for semilinear systems of PDEs},
	journal = {Communications in Contemporary MathematicsCommunications in Contemporary Mathematics},
	year = {2021},
	month = {2021/08/27},
	pages = {2150080},
	abstract = {<p>We prove existence results for systems of boundary value problems involving elliptic second-order differential operators. The assumptions involve lower and upper solutions, which may be either well-ordered, or not at all. The results are stated in an abstract framework, and can be translated also for systems of parabolic type.We prove existence results for systems of boundary value problems involving elliptic second-order differential operators. The assumptions involve lower and upper solutions, which may be either well-ordered, or not at all. The results are stated in an abstract framework, and can be translated also for systems of parabolic type.</p>},
	isbn = {0219-1997},
	url = {https://doi.org/10.1142/S0219199721500802},
	author = {Alessandro Fonda and Giuliano Klun and Andrea Sfecci}
}
