Lehar, Steven M.Worth, Andrew J.2011-11-142011-11-141991-04https://hdl.handle.net/2144/2072en-USCopyright 1991 Boston University. Permission to copy without fee all or part of this material is granted provided that: 1. The copies are not made or distributed for direct commercial advantage; 2. the report title, author, document number, and release date appear, and notice is given that copying is by permission of BOSTON UNIVERSITY TRUSTEES. To copy otherwise, or to republish, requires a fee and / or special permission.Technical ReportBoston University Trustees