title: Constraints on black hole charges in M87* and Sgr A* with the EHT observations
abstract: In May 2022 ICRANet organized the Workshop dedicated to the 80th anniversary of Professor Ruffini. This paper is based on the talk delivered at the meeting. Professor Ruffini was well known for Soviet scientific community not only due to his publications in leading journals but also due Russian translations of his books where he was an author or a contributor in collection of articles. But only in 1988 I had an opportunity to watch and listen professor R. Ruffini at the Conference dedicated to t
journal: arXiv (Cornell University)