Orch.B. 再版:New York: E.F. Kalmus, n.d.(1933-70). 分谱:Horn I in F, Horn II in F Tuckwell, Barry. Horn. New York: Schirmer Books. 1983: 33. ISBN 978-0-02-871530-8
_{i}=S_{ii}/T_{ii}} 。 Horn, R.A. and Johnson, C.R. Matrix Analysis. Cambridge University Press. 1985. ISBN 0-521-38632-2. (Section 2.3 and further at p