A description primarily of the periodic solutions of the restricted problems by means of generating solutions and their perturbations, but also of other solutions (conditionally-periodic, unbounded, arc solutions, etc.). The treatment is based on a systematic application of the local method (in particular, the method of normal forms) and the method of the global section (hypersurface of section), allowing a clear visual representation of the mutual disposition of solutions. Translated from the original Russian edition of 1990 (Moscow: Nauka). Annotation copyright Book News, Inc. Portland, Or.