Updated links to the references_test

content/references.bib

@@ -1,3 +1,11 @@
+@misc{kaggle-flight-price-data,
+  author = {Vivek Sharma},
+  title  = {Flight Price Data},
+  year = {2024},
+  url = {https://www.kaggle.com/datasets/viveksharmar/flight-price-data},
+  note = {Accessed: November 13, 2024}
+}
+
 @article{sun2024airline,
 author = {Sun, Xiaoqian and Zheng, Changhong and Wandelt, Sebastian and Zhang, Anming},
 year = {2024},
@@ -35,7 +43,8 @@ @article{borenstein1994competition
 title = {Competition and Price Dispersion in the U.S. Airline Industry},
 volume = {102},
 journal = {Journal of Political Economy},
-doi = {10.1086/261950}
+doi = {10.1086/261950},
+url = {https://www.jstor.org/stable/2138760}
 }
 
 @inbook{sherly2023machine,
@@ -45,7 +54,8 @@ @inbook{sherly2023machine
 pages = {901-912},
 title = {Machine Learning-Based Approach for Airfare Forecasting},
 isbn = {978-981-19-6633-0},
-doi = {10.1007/978-981-19-6634-7_65}
+doi = {10.1007/978-981-19-6634-7_65}, 
+url = {https://link.springer.com/chapter/10.1007/978-981-19-6634-7_65}
 }
 
 @article{kalampokas2023holistic,
@@ -66,7 +76,8 @@ @article{xu2021influential
 title = {Influential factors on Chinese airlines' profitability and forecasting methods},
 volume = {91},
 journal = {Journal of Air Transport Management},
-doi = {10.1016/j.jairtraman.2020.101969}
+doi = {10.1016/j.jairtraman.2020.101969},
+url = {https://www.sciencedirect.com/science/article/abs/pii/S0969699720305524?via%3Dihub}
 }
 
 @article{gillen2005economics,
@@ -92,7 +103,8 @@ @article{xiong2023aviation
 title = {Aviation and carbon emissions: Evidence from airport operations},
 volume = {109},
 journal = {Journal of Air Transport Management},
-doi = {10.1016/j.jairtraman.2023.102383}
+doi = {10.1016/j.jairtraman.2023.102383}, 
+url = {https://www.sciencedirect.com/science/article/abs/pii/S0969699723000261?via%3Dihub}
 }
 
 @article{brueckner2017airline,
@@ -103,13 +115,14 @@ @article{brueckner2017airline
 title = {Airline fuel usage and carbon emissions: Determining factors},
 volume = {62},
 journal = {Journal of Air Transport Management},
-doi = {10.1016/j.jairtraman.2017.01.004}
+doi = {10.1016/j.jairtraman.2017.01.004}, 
+url = {https://www.sciencedirect.com/science/article/abs/pii/S0969699716302976?via%3Dihub}
 }
 
 @misc{scikit-learn-ols,
-  author = {{scikit-learn developers},
-  year = {2023},
-  title = {Ordinary Least Squares},
-  url = {https://scikit-learn.org/stable/modules/linear_model.html#ordinary-least-squares},
-  note  = {Accessed: October 30, 2024}
+author = {{scikit-learn developers},
+year = {2023},
+title = {Ordinary Least Squares},
+url = {https://scikit-learn.org/stable/modules/linear_model.html#ordinary-least-squares},
+note  = {Accessed: October 30, 2024}
 }