Putnam, C. R. Absolute values of hyponormal operators with asymmetric spectra. (English) Zbl 0523.47013 Mich. Math. J. 30, 89-96 (1983). MSC: 47B20 47A10 PDFBibTeX XMLCite \textit{C. R. Putnam}, Mich. Math. J. 30, 89--96 (1983; Zbl 0523.47013) Full Text: DOI
Putnam, C. R. Rational approximation and Swiss cheeses. (English) Zbl 0373.30036 Mich. Math. J. 24, 193-196 (1977). MSC: 30E10 47B20 PDFBibTeX XMLCite \textit{C. R. Putnam}, Mich. Math. J. 24, 193--196 (1977; Zbl 0373.30036) Full Text: DOI
Putnam, C. R. A norm inequality in hyponormal operator theory. (English) Zbl 0304.47030 Mich. Math. J. 22(1975), 195-200 (1976). MSC: 47B20 PDFBibTeX XMLCite \textit{C. R. Putnam}, Mich. Math. J. 22, 195--200 (1976; Zbl 0304.47030) Full Text: DOI
Putnam, C. R. Group commutators of bounded operators in Hilbert space. (English) Zbl 0095.31301 Mich. Math. J. 7, 229-232 (1960). PDFBibTeX XMLCite \textit{C. R. Putnam}, Mich. Math. J. 7, 229--232 (1960; Zbl 0095.31301) Full Text: DOI