Progress of Theoretical PhysicsDegenerate Perturbation Theory in Quantum MechanicsK. Suzuki, R. OkamotoPublished Mar 1, 1984• 3 citationsPublisherAbstractKenji Suzuki, Ryoji Okamoto; Degenerate Perturbation Theory in Quantum Mechanics, Progress of Theoretical Physics, Volume 71, Issue 3, 1 March 1984, PagesDOI10.1143/ptp.71.670a