Jack Orenstein's Engheta number is 2:

• N. Engheta, W. D. Murphy, V. Rokhlin, and M. S. Vassiliou (1992) (alphabetical), "The Fast Multipole Method for Electromagnetic Scattering Computation," IEEE Transactions on Antennas and Propagation 40, 634-641.
• M. S. Vassiliou, J. A. Orenstein, "Computer Professional's Quick Reference", McGraw-Hill 1992.