Institution: | 1. Byurakan Astrophysical Observatory, 0213, Byurakan, Aragatsotn Province, Armenia 2. Centro de Astrofísica da Universidade do Porto, Rua das Estrelas, 4150-762, Porto, Portugal 3. Institut d’Astrophysique de Paris, UMR 7095 CNRS-UPMC, 98bis Bd Arago, 75014, Paris, France 4. INAF-Osservatorio Astronomico di Padova, Vicolo dell’Osservatorio 5, 35122, Padova, Italy
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