Sweden - 1974 Constitution

Part The Instrument of Government
Title Article 9
Chapter 3 - The Riksdag
Article

9

One member shall be appointed for every seat a party obtains, together with alternates for that member.

Categories - Electoral party (Electoral rules/formula)
Source Gisbert H. Flanz ed. 2004. Constitutions of the Countries of the World. Dobbs Ferry, New York: Oceana Publications.