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Gurvits, L. (author), Paragi, Zsolt (author), Amils, Ricardo I. (author), van Bemmel, Ilse (author), Casasola, Viviana (author), Conway, John (author), Masania, K. (author), Rajan, R.T. (author), Visser, P.N.A.M. (author)Ultra-high angular resolution in astronomy has always been an important vehicle for making fundamental discoveries. Recent results in direct imaging of the vicinity of the super-massive black hole in the nucleus of the radio galaxy M87 by the millimeter VLBI system Event Horizon Telescope (EHT) and various pioneering results of the Space VLBI...conference paper 2021