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References
Klaus Kornwachs
System surfaces: there is never just only one structure![Open Access Link](images/OAlink.png)
2013
in: Evolution of semantic systems, Dordrecht : Springer
![Open Access Link](images/OAlink.png)
Knowledge + skills + "x"![Open Access Link](images/OAlink.png)
2005
in: Professional knowledge management, Berlin : Springer
![Open Access Link](images/OAlink.png)
Data — information — knowledge: a trial of a technological enlightenment![Open Access Link](images/OAlink.png)
2000
in: Towards the information society, Dordrecht : Springer
![Open Access Link](images/OAlink.png)