![122371](/images/creator/_default.jpg)
Johannes Lenhard
Axiomatics without foundations. on the model-theoretical viewpoint in modern axiomatics
2005
Philosophia Scientiae 9/2
![Open Access](/images/book.png)
Deduction, perception, and modeling
2005
in: Activity and sign, Dordrecht : Springer
![Open Access Link](/images/OAlink.png)
Grounding mathematics education
2005
in: Activity and sign, Dordrecht : Springer
![Open Access Link](/images/OAlink.png)