of stellar systems: nearly spherical and strongly flattened. He initiated a numerical study of the dynamics of triple systems, developed a new approach to study the motion in the field of axially symmetric potential, and he suggested an essentially new method to investigate the structure and kinematics of the Milky Way Galaxy using radio observations of neutral hydrogen. His attractive book Stars, Galaxies, the Metagalaxy, translated into many languages, is the lodestar for many young astronomers. His manuals on probability theory and the treatment of observations are reference books for astronomers and physicists. (M 24121)

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