Coddington, E. A., & Snoo, H. S. V. d. (1981). Regular boundary value problems associated with pairs of ordinary differential expressions Earl A. Coddington, Hendrik S.V. de Snoo. Springer-Verlag. https://doi.org/10.1007/BFb0089057
Chicago Style (17th ed.) CitationCoddington, Earl A., and Hendrik Simon Victor de Snoo. Regular Boundary Value Problems Associated with Pairs of Ordinary Differential Expressions Earl A. Coddington, Hendrik S.V. De Snoo. Berlin ; New York: Springer-Verlag, 1981. https://doi.org/10.1007/BFb0089057.
MLA (9th ed.) CitationCoddington, Earl A., and Hendrik Simon Victor de Snoo. Regular Boundary Value Problems Associated with Pairs of Ordinary Differential Expressions Earl A. Coddington, Hendrik S.V. De Snoo. Springer-Verlag, 1981. https://doi.org/10.1007/BFb0089057.