Sweden - 1974 Constitution

Part The Instrument of Government
Title Article 2
Chapter 6 - The Government
Article

2

When a Prime Minister is to be appointed, the Speaker shall summon for consultation representatives from every party group in the Riksdag. [...]

Categories - Parliamentary party (Composition national legislature (parliament/ senate))
- Parliamentary party (Government formation)
Source Gisbert H. Flanz ed. 2004. Constitutions of the Countries of the World. Dobbs Ferry, New York: Oceana Publications.