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References
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* Websites: `<https://www.calculix.de/>`_, `<https://www.dhondt.de/>`_ 
* User Manual: `<https://www.dhondt.de/ccx_2.22.pdf>`_
* Examples: `<https://github.com/calculix/CalculiX-Examples>`_  Each example's README.md file contains the details.
* Pre/Post Processing: CalculiX GraphiX (CGX)