Kudzys, Antanas, and Romualdas Kliukas. “Precast Spun Concrete Piers in Road Bridges and Footbridges”. The Baltic Journal of Road and Bridge Engineering, vol. 3, no. 4, Dec. 2008, pp. 187-9, https://doi.org/10.3846/1822-427X.2008.3.187-197.