1. Center for Energy and Environmental Resources, The University of Texas at Austin, 10100 Burnet Road,
Building 133, M.S. R7100, Austin, Texas 78758, United States
2. Aerodyne Research, Inc., 45 Manning Road, Billerica, Massachusetts 01821-3976, United States
3. John Zink Company, 11920 East Apache, Tulsa, Oklahoma 74116, United States