Skrinskas, Skirmantas, and Arvydas Domatas. “Analysis of Lithuanian Gravel Roads Paving Programme Implementation in 1998–2005”. The Baltic Journal of Road and Bridge Engineering, vol. 1, no. 4, Dec. 2006, pp. 157-66, https://bjrbe-journals.rtu.lv/bjrbe/article/view/1822-427X.2006.4.157%E2%80%93166.