Dieter Althaus - the Minister President of Thuringia - proposed a so-called unconditional basic income scheme. A study of Opielka/Strengmann-Kuhn (2006) on this proposal is analysed in this project.

Spermann, Alexander (2007), Das Solidarische Bürgergeld - Anmerkungen zur Studie von Michael Opielka und Wolfgang Strengmann-Kuhn, in: Michael Borchard Lucius & Lucius Verlagsges. mbH, Stuttgart, 143-162.