Prokop, Viktor, Jan Stejskal, and Ondrej Kuba. “Effective Financing of Environmentally Adjusted Multifactor Productivity Growth in Sustainable Development Framework – An International Comparative Study”. European Journal of Sustainable Development 8, no. 3 (October 1, 2019): 172. Accessed July 6, 2020. https://ecsdev.org/ojs/index.php/ejsd/article/view/851.