Leighton, W. (1949). Principal Quadratic Functionals and Self-Adjoint Second-Order Differential Equations.
Citação norma ChicagoLeighton, Walter. Principal Quadratic Functionals and Self-Adjoint Second-Order Differential Equations. 1949.
MLA CitationLeighton, Walter. Principal Quadratic Functionals and Self-Adjoint Second-Order Differential Equations. 1949.
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