“…This problem is motivated by modeling the temperature in an isotropic medium with the average of non-uniform and nonlocal sources that provide a cooling or heating system, according to the properties of the function F with respect to the heat flow (y, s) → V (y, s) = u x (0, y, s) at the boundary S, see [11,13]. Some references on the subject are [6], where F 1 t t 0 u x (0, y, s) ds is replaced by F (u x (0, y, t)), or [7], where it is replaced by F t 0 u x (0, y, s) ds ; see also [4,14,23,24], where the semi-infinite case of this nonlinear problem with F (u x (0, y, t)) has been considered. The non-classical one-dimensional heat equation in a slab with fixed or moving boundaries was studied in [14,22].…”