H. O. Cordes

1925

• Elliptic pseudo-differential operators
• Pseudo-Differential Operators: Proceedings of a Conference, held in Oberwolfach, February 2-8, 1986 (Lecture Notes in Mathematics)
• Spectral theory of linear differential operators and comparison algebras
• The technique of pseudodifferential operators
• Boundary problems regardless of type
• Pseudo-differential operators
• The basic apriori estimates for elliptic systems of arbitrary order