The equations of thermal conductivity and deformation

Hello. Can you show which equations are used to solve thermal deformation (the equations of thermal conductivity and deformation in the default solver)? What is their appearance? Thank you in advance! For example, ANSYS uses the following equations:
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Check the CalculiX User’s Manual (http://www.dhondt.de/ccx_2.20.pdf) and the book by G. Dhondt (“The Finite Element Mthod for Three-dimensional Thermomechanical Applications”) which serves as a theory guide for CalculiX. PrePoMax is a pre- and postprocessor for CalculiX.