Operador normal (Spanish Wikipedia)

Analysis of information sources in references of the Wikipedia article "Operador normal" in Spanish language version.

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books.google.com

Andô, Tsuyoshi (1963). «Note on invariant subspaces of a compact normal operator». Archiv der Mathematik 14: 337-340. doi:10.1007/BF01234964.

Alexander Frei, Spectral Measures, Mathematics Stack Exchange, Existence, Uniqueness