Fixed into correct references.

Author: AlbertLee125

gdplib/cstr/README.md

@@ -5,8 +5,9 @@ The CSTRs have a single 1st order auto catalytic reaction A -> B and minimizes t
 The optimal solution should yield NT reactors with a recycle before reactor NT.
 
 Reference:
-> Linan, D. A., Bernal, D. E., Gomez, J. M., & Ricardez-Sandoval, L. A. (2021). Optimal synthesis and design of catalytic distillation columns: A rate-based modeling approach. Chemical Engineering Science, 231, 116294. https://doi.org/10.1016/j.ces.2020.116294
-
+> Linan, D. A., Bernal, D. E., Gomez, J. M., & Ricardez-Sandoval, L. A. (2020). Optimal design of superstructures for placing units and streams with multiple and ordered available locations. Part I: A new mathematical framework. Computers & Chemical Engineering, 137, 106794.
+https://doi.org/10.1016/j.compchemeng.2020.106794
+ 
 ### Solution
 
 Best known objective value: 3.06181298849707