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In that period he was Invited Professor at École Polytechnique Fédérale de Lausanne ( 1972–1973 ) and at the University of Illinois , Urbana ( 1979–1980 ) .
 organization: École Polytechnique Fédérale de Lausanne; organization: University of Illinois; location: Urbana
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 organization: École Polytechnique Fédérale de Lausanne; organization: University of Illinois; location: Urbana