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While searching around, I run into a posting under the following link. Would someone help to locate the Mathcad files?
https://community.ptc.com/t5/PTC-Mathcad-Questions/Boussinesq-Revisited/m-p/405553#M158998
Try to contact him directly.
The email address also appeared here: https://community.ptc.com/t5/PTC-Mathcad-Questions/Eurocode-engineering/td-p/390049