por Mason, J.M., coaut.
por Pedersen, N.J | Samdahl, D.R., coaut | National Research Council. Transportation Research Board (E-.U.A.).
por Allaman, Peter M | Tardiff, Timothy J., coaut.Dunbar, Frederick C., coaut | National Research Council. Transportation Research Board (E-.U.A.).
por Hanscom, Fred R | Pain, Richard F., coaut | National Research Council. Transportation Research Board (E-.U.A.).