Non-Stable Universe: Energetic Resources, Activity Phenomena, and Evolutionary Processes : proceedings of an international symposium dedicated to the 70th anniversary of the Byurakan Astrophysical Observatory (BAO) held at National Academy of Sciences of the Republic of Armenia (NAS RA), Yerevan and Byurakan Astrophysical Observatory (BAO), Byurakan, Armenia 19-23 September 2016 (2017)