http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Accuracy of trip end estimates from the home interview survey
by Vergil G. Stover, J. D. Benson, and Larry J. Ringer.
"Urban travel forecasting, research study number 2-10-71-167, sponsored by the Texas Highway Department in cooperation with the U.S. Department of Transportation, Federal Highway Administration."