title: [Recursion formula of energy levels for oxygen-like ions].
abstract: A recursion formula of energy levels for Oxygen-like ions has been given based on the generalization of the perturbation expansion. It is found that the formula is considerably simple and accurate.
authors.affiliation: Sichuan Union University, 610065 Chengdu.
authors.forename: Z
authors.initials: Z
authors.lastname: Xu
authors.forename: Y
authors.initials: Y
authors.lastname: Gao