Institution: | 1. Ilia State University, Colokashvili Av. 3/5, Tbilisi, 0162, Georgia;2. E. Kharadze National Astrophysical Observatory, Mt. Kanobili, Abastumani, 0803, Georgia;3. INAF, Osservatorio Astronomico di Brera, Via E. Bianchi 46, 23807 Merate, Italy |