"Frequently Asked Questions". State System Membership List, v2016 (Version 2002.1 ed.). Correlates of War Project. February 21, 2017. Retrieved 2022-07-15.
Miller 2021 cites Gleditsch & Ward 1999 and compares the technical compatibility of both systems. Miller, Steven V. (2021-12-24). "A Discussion of the Two State Systems (CoW, G-W)". {peacesciencer}: An R Package for Quantitative Peace Science Research Conflict Management and Peace Science. Retrieved 2022-07-15. Gleditsch, Kristian S.; Ward, Michael D. (1999). "A revised list of independent states since the congress of Vienna". Empirical and Theoretical Research in International Relations. 25 (4): 393–413. doi:10.1080/03050629908434958.
Miller 2021: "The CoW system is, as far as I can tell, the first of its kind to devise numeric codes for states in the international system while also offering a temporal dimension." Miller, Steven V. (2021-12-24). "A Discussion of the Two State Systems (CoW, G-W)". {peacesciencer}: An R Package for Quantitative Peace Science Research Conflict Management and Peace Science. Retrieved 2022-07-15.
Miller 2021 cites Gleditsch & Ward 1999 and compares the technical compatibility of both systems. Miller, Steven V. (2021-12-24). "A Discussion of the Two State Systems (CoW, G-W)". {peacesciencer}: An R Package for Quantitative Peace Science Research Conflict Management and Peace Science. Retrieved 2022-07-15. Gleditsch, Kristian S.; Ward, Michael D. (1999). "A revised list of independent states since the congress of Vienna". Empirical and Theoretical Research in International Relations. 25 (4): 393–413. doi:10.1080/03050629908434958.
