Titehmarsh, E. (1970). Eigenfunction expansions associated with second order differential equations. Clarendon.
Citación estilo ChicagoTitehmarsh, E.C. Eigenfunction Expansions Associated with Second Order Differential Equations. Oxford: Clarendon, 1970.
Cita MLATitehmarsh, E.C. Eigenfunction Expansions Associated with Second Order Differential Equations. Clarendon, 1970.
Warning: These citations may not always be 100% accurate.