Elliptic partial differential equations and ordinary differential equations in Banach space Nirenberg, L. (1963) Differential Equations and Their Applications
Energetic estimates analogous to the Saint-Venant principle and their applications Oleinik, O. A. (1979) Equadiff IV
Equivalence of differential equations and differential algebras Jakubczyk, Bronisłav (1994) Equadiff 8
Exponential representation of solutions of ordinary differential equations Gamkrelidze, H. (1979) Equadiff IV
Extrapolation of finite element solutions on non-uniform quadrilateral meshes Lin, Qun (1990) Equadiff 7