Helvetica physica acta · 1976 · 102 citations · 0 references
Natural SciencesPhysicsMathematical PhysicsQuantum MechanicsTheoretical PhysicsBeyond The Standard Model PhysicsPerturbation TheoryQuantum Field TheoryRelativistic Quantum MechanicsDegenerate Perturbation TheoryMany-body Perturbation TheoryNon-degenerate Perturbation TheoryNon-perturbative EffectsQuantum Mechanical Perturbation Theory