Birkhoff, G. D. (1917). A Theorem on Series of Orthogonal Functions with an Application to Strum-Liouville Series.
Citação norma ChicagoBirkhoff, George D. A Theorem On Series of Orthogonal Functions With an Application to Strum-Liouville Series. 1917.
Citação norma MLABirkhoff, George D. A Theorem On Series of Orthogonal Functions With an Application to Strum-Liouville Series. 1917.
Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.