Karman, Agnieszka, Arkadiusz Kijek, and Tomasz Kijek. “Eco-Innovation Paths: Convergence or Divergence?”. Technological and Economic Development of Economy 26, no. 6 (November 17, 2020): 1213-1236. Accessed May 16, 2021. https://journals.vgtu.lt/index.php/TEDE/article/view/13384.