1. Ervin , R. D. , et al. Ad Hoc Study of Certain Safety-Related Aspects of Double-Bottom Tankers , Report No. UM-HSRI-78-18 , Highway Safety Research Institute, University of Michigan , May 1978 .
2. Isermann , H. , Overturning Limits of Articulated Vehicles with Solid and Liquid Roads , The Motor Industry Research Association , England , 1970 .