Scuffham, P. A. Are there seasonal unit roots in traffic crash data? Fabrizio Serra Editore Is part of International journal of transport economics : Rivista internazionale di economia dei trasporti : XXX, 3, 2003 Permissions Streaming only download Copy/paste Printing Streaming only | NO download | NO Copy/paste | NO Printing EUR 45.00 VAT Excluded Purchase PDF a Article