Transformations massive-like

These papers also in large measure initiated the construction of the theory of quasars. To this day, three quasar models are discussed the supermassive star, the packed star cluster, and accretion on supermassive black holes. Ya.B. has made a major contribution to the investigation of all three models. As early as 1965, he and M.A. Podurets [23 ] discovered that, like a single massive star, star clusters evolve, transforming into a black hole. 

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