Financial support by the Deutsche Forschungsgemeinschaft through Grant No. KR 2912/10-1, the FCT (Projects No. PTDC/FIS-NAN/4662/2014 and No. P2020-PTDC/FISNAN/3668/2014), and the MINECO-Spain (MAT2016-78625-C2) is acknowledged. J.L.L. acknowledges financial support from… Click to show full abstract
Financial support by the Deutsche Forschungsgemeinschaft through Grant No. KR 2912/10-1, the FCT (Projects No. PTDC/FIS-NAN/4662/2014 and No. P2020-PTDC/FISNAN/3668/2014), and the MINECO-Spain (MAT2016-78625-C2) is acknowledged. J.L.L. acknowledges financial support from the ETH Zurich Postdoctoral Fellowship program.
               
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