AAVIK, Andrus. Estonian Road Network and Road Management. The Baltic Journal of Road and Bridge Engineering, Riga, Latvia, v. 1, n. 1, p. 39–44, 2006. Disponível em: https://bjrbe-journals.rtu.lv/bjrbe/article/view/1822-427X.2006.1.39%E2%80%9344.. Acesso em: 2 may. 2024.