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Department of Physics, University of Minnesota Duluth, Duluth MN 55812-2496, USA | Tel: +1 218 726 8557 | Mobile: +1 218 269 1286 | Email:  |
| Department of Physics, University of Minnesota Duluth, Duluth MN 55812-2496, USA | Tel: +1 218 726 8557 | Mobile: +1 218 269 1286 | Email: |
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