1. Low density traffic streams;Brown;Adv. Appl. Prob.,1972
2. On the frequency of accidents of different types;Gustavsson;Accid. Anal. & Prev.,1971
3. Mathematical Theories of Traffic Flow;Haight,1963
4. The relationship between speeds and accidents;Palmgren,1974
5. Convergence and invariance questions for point systems in R1 under random motion;Thedéen;Ark. Mat.,1967