8R.D. Austin, J.L. Carson. An alternative accident prediction model for highway-rail interfaces[J]. Accident Analysis and Prevention, 2002, 34 ( 1 ) : 31 - 42
9S.C. Mok, I. Savage. Why has safety improved at rail-highway grade crossings?[J].Risk Analysis, 2005, 25(4) : 867 - 881
10C. A. Petri, fundamentals of a theory of asynchronous information flow[A]. Proceedings of IFIP Congress 62[C]. Amsterdam : North Holland, 1963:386 - 390
