Titchmarsh, E. C. (1950). Eigenfunction expansions: Associated with second-order differential equations (1st ed., repr.). Clarendon Press.
Chicago-Zitierstil (17. Ausg.)Titchmarsh, Edward C. Eigenfunction Expansions: Associated with Second-order Differential Equations. 1st ed., repr. Oxford: Clarendon Press, 1950.
MLA-Zitierstil (9. Ausg.)Titchmarsh, Edward C. Eigenfunction Expansions: Associated with Second-order Differential Equations. 1st ed., repr. Clarendon Press, 1950.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.