Institution: | School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife, KY16 9SS, Scotland, UK, GB Department of Nonlinear and Quantum Optics, Inst. Solid State Physics and Optics, P.O. Box 49, 1525 Budapest, Hungary, HU Physics Department, Royal Institute of Technology (KTH), Lindstedtsv?gen 24, 10044 Stockholm, Sweden, SE
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