Funding for this research was provided by:
Universität Bayreuth
Article History
Received: 9 April 2025
Accepted: 21 November 2025
First Online: 6 December 2025
Change Date: 24 December 2025
Change Type: Update
Change Details: In this article, the prime symbol (') was missing in the derivative Zr'(x) and has now been corrected.
Declarations
:
: The authors declare that they have no conflict of interest.