Basler Zeitung, 18 June 1992

External links

* Rolf d'Aujourd'hui: , Historic Lexicon of Switzerland, retrieved 20 May 2013
* Karl Rammstein: , 13. Juni 2004, retrieved 20 May 2013
* Hannes Hanggi: (pdf; 844 kB), Basler Zeitung, 8 December 2007, retrieved 20 May 2013
* Gianni Mazzucchelli: (pdf; 9.5 MB), retrieved 20 May 2013
* , guajara.com, retrieved 20 May 2013
*
* Reference at (PDF; 160 kB);

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