Ridendo dicere verum telling the truth with a smile - Koornstra, M. J.; Stichting Wetenschappelijk Onderzoek Verkeersveiligheid (Leidschendam Institute for Road Safety Research SWOV, The Netherlands, 1988)
'R-87-35.'
Bibliography: p. 19-20.
Keywords: Traffic safety -- Mathematical models; Traffic safety -- Planning -- Mathematical models