Similar Items: Strong coupling expansion of tHe Liouville model.
- The derivation of effective hamiltonians.
- Series Development of tlie Solution of an Eigenvalue Problem.
- The Beliaev-Zelivinsky boson expansion and particle-vibration coupling methods in an exactly soluble model
- Sturmian theory for ordinary differential equations
- Covalency and orbit-lattice coupling
- The contact hyperfine interaction: An ill-defined problem.