| LC control no. | n 80045054 |
|---|---|
| Personal name heading | Helgason, Sigurdur, 1927- |
| Variant(s) | Khelgason, S., 1927- Sigurður Helgason, 1927- |
| Biography/History note | Dept. of Math., MIT, Cambridge |
| Special note | Old catalog hdg.: Helgason, Sigurður, 1927- |
| Found in | Author's Differential geometry and symmetric spaces, 1962. His Gruppy i geometricheskiĭ analiz, 1987: t.p. (S. Khelgason) Stærðfræðingurinn Ólafur Dan Daníelsson, 1996: t.p. (Sigurður Helgason) |
| Invalid LCCN | n 2011078352 |
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