Douglas, R. G. On the spectrum of a class of Toeplitz operators. (English) Zbl 0177.41203 J. Math. Mech. 18, 433-435 (1969). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 1 Document Keywords:functional analysis PDFBibTeX XMLCite \textit{R. G. Douglas}, J. Math. Mech. 18, 433--435 (1969; Zbl 0177.41203)