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A celebration of Frei Otto 1925-2015 - Buro Happold
Frei Otto The Pritzker Architecture Prize
Pritzker Prize for Frei Otto, German Architect, Is Announced After His Death - The New York Times
German architect Frei Otto dies, aged 89 – DW – 03/10/2015
Inventing, experimenting, and collaborating: The Architectural Biography of Frei Otto
Frei Otto - Wikipedia
Frei Otto Dies Arquitectura Viva
German Architect Frei Otto Awarded the 2015 Pritzker Architecture Prize
Architect Frei Otto named Pritzker prize winner one day after his death, Architecture
Frei Otto - Wikipedia
Inventing, experimenting, and collaborating: The Architectural Biography of Frei Otto