CALVI, Alessandro; GACA, Stanisław; KAMIŃSKI, Tomasz; KIEĆ, Mariusz; KRUSZEWSKI, Mikołaj. Guidelines for the use of non-standard road signs - Polish experiences. Archives of Civil Engineering, [S. l.], v. 67, n. 1, p. 461–479, 2021. DOI: 10.24425/ace.2021.136483. Disponível em: https://wydawnictwo.pan.pl/index.php/ace/article/view/3742. Acesso em: 20 oct. 2026.