“Symmetric forms of the equations of heat transport in a rigid conductor of heat with internal state variabies. II. Alternative symmetric systems”, Arch. Mech., vol. 50, no. 2, pp. 175–205, Jan. 1998, Accessed: May 13, 2025. [Online]. Available: https://am3.ippt.pan.pl/index.php/am/article/view/v50p175