The talk given at RREPS 2015 in Saint Peterburg is available at http://projet.etalon.free.fr/papers/RREPS15/201509_RREPS_Smith_Purcell_Delerue.pdf
- Financially supported by the Université Paris-Sud (programme “attractivité"), by the French ANR (contract ANR-12-JS05-0003-01) and by IN2P3.