Update README.md

Author: stefano-galelli

README.md

@@ -71,6 +71,6 @@ PowNet development is supported by Singapore's Ministry of Education (MoE) throu
 Following is a list of papers that used PowNet:
 1.	Galelli, S., Dang, T.D., Ng, J.Y., Chowdhury, A.F.M.K., Arias, M.E. (2022) Curbing hydrological alterations in the Mekong–limits and opportunities of dam re-operation. Nature Sustainability, [Link](https://www.nature.com/articles/s41893-022-00971-z)
 2.	Koh, R., Kern, J., Galelli, S. (2022) Hard-coupling water and power system models increases the complementarity of renewable energy sources. Applied Energy, 321, 119386. [Link](https://www.sciencedirect.com/science/article/abs/pii/S0306261922007255)
-3.	Chowdhury, A.K., Dang, T.D., Nguyen, H.T., Koh, R., and Galelli, S., (2021). The Greater Mekong's climate-water-energy nexus: how ENSO-triggered regional droughts affect power supply and CO2 emissions. Earth’s Future, 9, e2020EF001814, DOI: https://doi.org/10.1029/2020EF001814.
-4.	Chowdhury, A.K., Dang, T.D., Bagchi, A., and Galelli, S., (2020b). Expected benefits of Laos' hydropower development curbed by hydro-climatic variability and limited transmission capacity—opportunities to reform. Journal of Water Resources Planning and Management, DOI: https://doi.org/10.1061/(ASCE)WR.1943-5452.0001279, [(RG-link)](https://www.researchgate.net/publication/341276238_Expected_benefits_of_Laos'_hydropower_development_curbed_by_hydro-climatic_variability_and_limited_transmission_capacity--opportunities_to_reform).
-5.	Chowdhury, A.K., Kern, J., Dang, T.D. and Galelli, S., (2020a). PowNet: A Network-Constrained Unit Commitment/Economic Dispatch Model for Large-Scale Power Systems Analysis. Journal of Open Research Software, 8(1), p.5. DOI: http://doi.org/10.5334/jors.302.
+3.	Chowdhury, A.K., Dang, T.D., Nguyen, H.T., Koh, R., and Galelli, S., (2021). The Greater Mekong's climate-water-energy nexus: how ENSO-triggered regional droughts affect power supply and CO2 emissions. Earth’s Future, 9, e2020EF001814, [Link](https://doi.org/10.1029/2020EF001814).
+4.	Chowdhury, A.K., Dang, T.D., Bagchi, A., and Galelli, S., (2020b). Expected benefits of Laos' hydropower development curbed by hydro-climatic variability and limited transmission capacity—opportunities to reform. Journal of Water Resources Planning and Management, [Link](https://doi.org/10.1061/(ASCE)WR.1943-5452.0001279) 
+5.	Chowdhury, A.K., Kern, J., Dang, T.D. and Galelli, S., (2020a). PowNet: A Network-Constrained Unit Commitment/Economic Dispatch Model for Large-Scale Power Systems Analysis. Journal of Open Research Software, 8(1), p.5. [Link](http://doi.org/10.5334/jors.302).