Correlation deals with interconnection of subsystems and is a key to understanding complex systems.
Polarization and Correlation Phenomena in Atomic Collisions , by Vsevolod V. Balashov, Alexei N. Grum-Grzhimailo, and Nikolai M. Kabachnik, grew out of a course in atomic and nuclear physics at Moscow State University, begun over thirty years ago. The scope covers quantum theory of collisions, group theory, solid state physics, atomic spectroscopy, physics of nuclear reactions, and particle propagation through matter. Kabachnik, also a Balashov collaborator, has an international reputation with an impressive track record working with experimental groups around the world. Their book can be read by a person with a background in elementary quantum mechanics and general atomic physics at the undergraduate level. All necessary information about polarization and correlation is included.