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| Collenberg, Adolf. Siegrist, Gottlieb [Götti]. En: Lexicon istoric retic (bio.). Versiun da stampa 2008. |
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| Collenberg, Adolf. Aviatica. En: Lexicon istoric retic (tem.). Versiun da stampa 2008. |
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| Küng, Roland. Gottfried Siegrist – il pionier da l’aviatica grischuna festivescha ses 100avel anniversari. En: La Quotidiana 29-11-2000, p. 13. |
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