Pritzker Prize for Frei Otto, German Architect, Is Announced After
German architect Frei Otto, 89, dies day before winning Pritzker Prize, The Independent
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Venice Biennale Frei Otto's Multihalle at 'Freespace”
Frei Otto - Wikipedia
The Pritzker Architecture Prize (page 8)
Inventing, experimenting, and collaborating: The Architectural Biography of Frei Otto
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Arquitectura Adaptable - Jose Ignacio Balaguer Palacios by Jose Ignacio Balaguer Palacios - Issuu
Pritzker Prize for Frei Otto, German Architect, Is Announced After His Death - The New York Times