Grabowski, Ryszard J. “Ellipse Offset Curves in the Formation of Turbo-Roundabouts”. Roads and Bridges - Drogi i Mosty 14, no. 3 (October 16, 2015): 193–202. Accessed November 21, 2024. https://rabdim.pl/index.php/rb/article/view/v14n3p193.