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Journal of physics / G, 42 (2015) 2, S. 023101 -
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Physical Review A Physical review / A, 91 91 (2015 2015) 4 4, S. 043606 043606
OpenAccess  OpenAccess 
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Physical Review D Physical review / D, 92 92 (2015 2015) 9 9, S. 094518 094518
OpenAccess  OpenAccess