[22] reached a similar conclusion when comparing Zuritz's AS for TTHE-A (see Eq. ( ) in ) with the "compact solution form for TTHE-A" proposed by the same authors. These comparisons were performed with Zuritz expressions for the case of 𝑇 0 (0) = 𝑇 2 (0) (see Eq. ( ), from ). It is noteworthy that Zuritz is the first to present an analytical solution for a TTHE thermal model . However, in Zuritz's work there is no explicit analysis of the character of the roots , but due to the form of his solution he must have considered them as real and distinct (which is correct for TTHE-A ). The root character analysis for TTHE-A was a result of the work initiated by Ünal , corrected by Ünal (Appendix), and completed by Batmaz and Sandeep and by