Böttge, I., H. Kumpar Zidanič, and A. Tzamalikou. “From Green Vision to Legal Obligation: The Case for Making Green Public Procurement Mandatory”. Croatian Yearbook of European Law and Policy, vol. 19, Oct. 2023, pp. 249–280, https://www.cyelp.com/index.php/cyelp/article/view/519.