L. Vasconcelos, A. B. Silva, Álvaro Seco, and J. Silva, “Estimating the Parameters of Cowan’s M3 Headway Distribution for Roundabout Capacity Analyses”, BJRBE, vol. 7, no. 4, pp. 261–268, Dec. 2012, doi: 10.3846/bjrbe.2012.35.