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Visiting Positions
| Visiting Fellow at Cornell University |
19700615 - 19710715 |
| Visiting Professor at Cornell University |
19730801 - 19740831 |
| Guest Scientist at IBM, Yorktown Height |
19820705 - 0802 |
| Visiting Professor at Cornell University |
19830317 - 0410 |
| ITP, Santa Barbara |
198307 |
| Visiting Professor at DTU, Lyngby, Denmark |
19890501 - 0531 |
| Visiting Professor at Rutgers University |
19890801 - 1991 |
| Universidad Autonomas, Madrid |
199105 |
| Rutgers University |
199108 |
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