BibTex format
@inbook{Ivanov:1988,
author = {Ivanov, MY and Melikishvili, ZG},
booktitle = {Nonlinear Spectroscopy of Atoms and Diatomic Molecules},
editor = {Delone},
title = {Multiphoton matrix elements for interaction of an atom with polarized light},
year = {1988}
}