Isacsson, Ulf. “Condition Assessment of Road Equipment – State-of-the-Art”. The Baltic Journal of Road and Bridge Engineering 3, no. 2 (June 29, 2008): 84–92. Accessed April 28, 2024. https://bjrbe-journals.rtu.lv/bjrbe/article/view/1822-427X.2008.3.84-92.