The few-body problem has always been of special significance in natural sciences, whether it is a classical problem in celestial mechanics or a more complicated quantum problem. A considerable portion of objects that are studied in quantum physics and chemistry are few-body systems. Such objects as atoms, molecules, nuclei, quantum dots, hadrons, etc. represent typical examples of those systems. Inability to solve the few-body problem for these systems with sufficient accuracy often represents a major limiting factor in scientific research.