https://www.esri.ie/system/files/publications/SUSTAT123_2.pdf
https://ecipe.org/wp-content/uploads/2020/07/ECI_20_OccPaper_04_2020_LY05.pdf
https://www.brookings.edu/blog/up-front/2017/08/03/the-hutchins-center-explains-the-debt-limit/?utm_campaign=Brookings%20Brief&utm_source=hs_email&utm_medium=email&utm_content=54989469
https://www.sciencedirect.com/science/article/pii/S0022199617301411