Salamon, S. M. Harmonic 4-spaces. (English) Zbl 0562.53014 Math. Ann. 269, 169-178 (1984). Reviewer: J.P.Bourguignon MSC: 53B20 53C25 PDF BibTeX XML Cite \textit{S. M. Salamon}, Math. Ann. 269, 169--178 (1984; Zbl 0562.53014) Full Text: DOI EuDML OpenURL
Helgason, S. Differential operators on homogeneous spaces. (English) Zbl 0146.43601 Acta Math. 102, 239-299 (1959). PDF BibTeX XML Cite \textit{S. Helgason}, Acta Math. 102, 239--299 (1959; Zbl 0146.43601) Full Text: DOI OpenURL