Maroulis, G. (1988). Electrical-properties for Hco+ and Nnh+ From 4th-order Moller-plesset Perturbation-theory. Zeitschrift fuer Naturforschung. Section A: A Journal of Physical Sciences, 43(5), 419-429. https://hdl.handle.net/2078.5/139752 (Original work published 1988)