1. Modelling encounter rates in marine traffic flows with particular application to the Dover Strait;Draper;Journal,1972
2. 3Liverpool Underwriters Association Annual Reports (1973).
3. Estimating global traffic flows;Thompson;Journal,1972
4. Encounter rates in a marine traffic separation scheme;Barratt;Journal,1973
5. 2 Lloyd's Register of Shipping. Statistical Tables (1963 and 1973).