Frolova, L., and D. Kauzena. “Assessment Methods for Impact of Environmentally Friendly Entrepreneurship and Driving Forces to the Quality of Environment”. Mathematical Modelling and Analysis 7, no. 1 (June 30, 2002): 33-40. Accessed May 2, 2024. https://journals.vilniustech.lt/index.php/MMA/article/view/9826.