@Article{Karpowicz2013, author = "Karpowicz, Adrian", title = "The maximum principle for viscosity solutions of elliptic differential functional equations", journal = "Opuscula Math.", year = "2013", volume = "33", number = "1", pages = "99--105", doi = "http://dx.doi.org/10.7494/OpMath.2013.33.1.99", url = "http://dx.doi.org/10.7494/OpMath.2013.33.1.99", abstract = "This paper is devoted to the study of the maximum principle for the elliptic equation with a deviated argument. We will consider viscosity solutions of this equation.", keywords = "maximum principle, viscosity solution, elliptic equations", issn = "1232-9274" }