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...Engels, R....
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IEEE transactions on nuclear science, 48 (2001) S. 625 - 627
...Engels, R....
OpenAccess 
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IEEE transactions on nuclear science, 48 (2001) S. 1114
...Engels, R....
OpenAccess 
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IEEE transactions on nuclear science, 47 (2001) S. 2699
...Engels, R....
OpenAccess 
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