Revise README with updated paper links

Updated DOI link and added preprint reference.

Author: JeroenGar

README.md

@@ -1,8 +1,9 @@
 # GDRR-2BP ![workflow](https://github.com/JeroenGar/gdrr-2bp/actions/workflows/rust.yml/badge.svg)[![DOI](https://zenodo.org/badge/doi/10.1016/j.ejor.2021.11.031.svg)](https://doi.org/10.1016/j.ejor.2021.11.031)
 
-**This repo contains a Rust 🦀 implementation of the algorithm described in [a goal-driven ruin and recreate heuristic for the 2D variable-sized bin packing problem with guillotine constraints]( https://www.sciencedirect.com/science/article/abs/pii/S0377221721009826).** 
+**This repo contains a Rust 🦀 implementation of the algorithm described in [a goal-driven ruin and recreate heuristic for the 2D variable-sized bin packing problem with guillotine constraints](https://doi.org/10.1016/j.ejor.2021.11.031).** 
 
-The accepted version of the paper is freely available **[here](https://lirias.kuleuven.be/3633246&lang=en)**.
+A preprint of the accepted version of the paper is freely available **[here](
+https://doi.org/10.48550/arXiv.2508.19306)**.
 
 The code used in the experiments in the paper was originally written in Java.
 Due to contractual obligations, this codebase can unfortunately not be made public.