1. President, Percheron Power LLC, 6855 W. Clearwater, A101-260, Kennewick, WA 99336.
2. Research Engineer, Pacific Northwest National Laboratory, Richland, WA 99354.
3. Technical Consultant, D-99084 Erfurt, Germany.
4. Professor Emeritus of Mathematics, Dept. of Mathematics, Drexel Univ., Philadelphia, PA 19104 (corresponding author).