Funciones de Green para Ecuaciones Diferenciales con Involuciones
  In this work we revise the most recent developments concerning the study of first order problems regarding differential equations with involutions. We take into account two cases: the case of initial conditions and constant coefficients and the case of homogeneous boundary conditions and non-constant coefficients. Using different techniques, we obtain the Green's function for both problems, study its sign and derive further results. 
F. Adri\'an F. Tojo
math.CA