| 1974 – 1980 |
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| 1986 |
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| 1980 – 2002 |
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Feb. – Aug. 1996 Jan. – Dec. 1997 |
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| Sept. – Dec. 1996 |
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| 1998 – 1999 |
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| 2000 – 2002 |
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| 2003 – 2004 |
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| 2005 until now |
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| Oct. – Dec. 2005 |
| Visiting Researcher in Cornell University, Ithaca, NY |
 |
1/D-expansion and planetary states of helium; issues of semiclassical
theory, in a group of G. Ezra. |
|