Comparison of emissions from on-road sources using a mobile laboratory under various driving and operational sampling modes oleh M. Zavala, A. M. Trimborn, J. T. Jayne, D. D. Nelson, E. C. Wood, E. Dunlea, S. C. Herndon, C. E. Kolb, D. T. Allen, W. B. Knighton, A. Mendoza, M. J. Molina, L. T. Molina