Huby, R. (1961). ”Formulae for Non-degenerate Rayleigh-Schrödinger Perturbation Theory in any order”. Proceedings of the Physical Society 78 (4): sid. 529. doi:10.1088/0370-1328/78/4/306. ISSN0370-1328.
Huby, R. (1961). ”Formulae for Non-degenerate Rayleigh-Schrödinger Perturbation Theory in any order”. Proceedings of the Physical Society 78 (4): sid. 529. doi:10.1088/0370-1328/78/4/306. ISSN0370-1328.