Update references

Author: jinningwang

assets/bibliography/papers.bib

@@ -1410,6 +1410,7 @@ @online{epa2024gridregions
   month        = {December},
   day          = {26},
   url = {https://www.epa.gov/green-power-markets/us-grid-regions},
+  html = {https://www.epa.gov/green-power-markets/us-grid-regions},
   bibtex_show = {true},
 }
 
@@ -1421,6 +1422,7 @@ @online{tc2021iec61970
   month        = {June},
   day          = {04},
   url = {https://webstore.iec.ch/en/publication/63866},
+  html = {https://webstore.iec.ch/en/publication/63866},
   bibtex_show = {true},
   abstract = {Energy management system application program interface (EMS-API) - Part 600-1: Common Grid Model
   Exchange Standard (CGMES) - Structure and rules},
@@ -1434,6 +1436,7 @@ @online{ferc2021rule
   month        = {December},
   day          = {16},
 	url = {https://www.ferc.gov/news-events/news/ferc-rule-improve-transmission-line-ratings-will-help-lower-transmission-costs},
+	html = {https://www.ferc.gov/news-events/news/ferc-rule-improve-transmission-line-ratings-will-help-lower-transmission-costs},
 }
 
 @online{pjm2022dlr,
@@ -1444,6 +1447,7 @@ @online{pjm2022dlr
   month        = {October},
   day          = {24},
 	url = {https://www.ferc.gov/news-events/news/ferc-rule-improve-transmission-line-ratings-will-help-lower-transmission-costs},
+	html = {https://www.powermag.com/understanding-the-april-2025-iberian-peninsula-blackout-early-analysis-and-lessons-learned/},
   abstract = {Initiated in 2020 by transmission owner PPL Electric Utilities and facilitated by PJM, PPL Electric Utilities has
   said it expects the activation of dynamic line rating (DLR) technology to expand capacity and promote market efficiency on
   three historically congested lines. PPL Electric Utilities estimates that this DLR project can save customers $23 million
@@ -1458,6 +1462,7 @@ @online{larson2025iberian
   month        = {May},
   day          = {8},
 	url = {https://www.powermag.com/understanding-the-april-2025-iberian-peninsula-blackout-early-analysis-and-lessons-learned/},
+	html = {https://www.powermag.com/understanding-the-april-2025-iberian-peninsula-blackout-early-analysis-and-lessons-learned/},
 }
 
 @online{leader2025iberian,
@@ -1468,4 +1473,5 @@ @online{leader2025iberian
   month        = {May},
   day          = {9},
 	url = {https://sepapower.org/knowledge/april-2025-iberian-blackout/},
+	html = {https://sepapower.org/knowledge/april-2025-iberian-blackout/},
 }