Uncertainty in Weighting Formulary Apportionment Factors and its Impact on After-Tax Income of Multinational Groups, arqus, Quantitative Research in Taxation, <link www.arqus.info/mobile/paper/arqus_184.pdf - external-link-new-window "Opens external link in new window">Discussion Paper No. 184</link>, <link www.arqus.info/>www.arqus.info</link>.