Sieberer, UlrichUlrichSieberer0000-0003-4027-13932020-02-272020-02-2720061357-2334https://fis.uni-bamberg.de/handle/uniba/47379engParty unity in parliamentary democracies: A comparative analysisarticle10.1080/13572330600739413https://doi.org/10.1080%2F13572330600739413