Apresentação de Dagmar Steffen disponível em: http://nordcode.tkk.fi/thesisbasics_papers/Dagmar_Steffen.pdf
Dagmar.Steffen@gmx.de
Department of Art and Design History, Bergische Universität Wuppertal, German
http://www2.uiah.fi/sefun/DSIU_papers/DSIU_Steffen%20_%20Design%20Semantics%20of%20Innovation.pdf
