Prokop, Viktor, Jan Stejskal, Petr Hajek, and Ondrej Kuba. “Creating Eco-Innovations for Sustainable Entrepreneurship and Development Within European Countries”. European Journal of Sustainable Development 8, no. 3 (October 1, 2019): 183. Accessed July 9, 2020. http://ecsdev.org/ojs/index.php/ejsd/article/view/853.