Update README.md

Author: mforets

README.md

@@ -47,9 +47,9 @@ This library has been applied in a number of scientic works.
 
 The articles appear in reverse chronological order.
 
-[19] **LazySets. jl: Scalable Symbolic-Numeric Set Computations.** Marcelo Forets and Christian Schilling. arXiv preprint arXiv:2110.01711 (2021). Submitted to JuliaCon'21 Proceedings.
+[19] **LazySets. jl: Scalable Symbolic-Numeric Set Computations.** Marcelo Forets and Christian Schilling. arXiv preprint [arXiv:2110.01711](https://arxiv.org/abs/2110.01711) (2021). Submitted to JuliaCon'21 Proceedings.
 
-[18] **Reachability of weakly nonlinear systems using Carleman linearization.** Marcelo Forets and Christian Schilling. arXiv preprint arXiv:2108.10390 (2021). Accepted in: 15th International Conference on Reachability Problems (2021). October 25-27 2021, Liverpool, UK.
+[18] **Reachability of weakly nonlinear systems using Carleman linearization.** Marcelo Forets and Christian Schilling. arXiv preprint [arXiv:2108.10390](https://arxiv.org/abs/2108.10390) (2021). Accepted in: 15th International Conference on Reachability Problems (2021). October 25-27 2021, Liverpool, UK.
 
 [17] **Combined Exact and Heuristics Based Approach to Hamiltonian Path Problem Optimization for Route Planning.** Fernando Hernandez, Rafael Sotelo and Marcelo Forets (2021). In Winkenbach, M., Parks, S., & Noszek, J. (Eds.), [Technical Proceedings of the 2021 Amazon Last Mile Routing Research Challenge](https://hdl.handle.net/1721.1/131235) (pp. XXI.1–XXI.12). MIT Libraries.