In one of these collaborations with Enrico Magenes, they were investigating inhomogeneous boundary problems for elliptic equations and inhomogeneous initial-boundary value problems for parabolic and hyperbolic evolution equations.
Sa isa sa mga collaborations sa Enrico Magenes, sila ay investigating inhomogeneous boundary problema para sa tambilugin equation at inhomogeneous unang-hangganan na halaga para sa mga problema paparabola at hayperboliko ebolusyon equation.