by J. Keilson and L.D. Servi.
Cover title. "Submitted to Performance Evaluation, 1989"--Cover. On t.p. "[infinity]" appears as the symbol.
Includes bibliographical references (p. 12-13).
Research partially supported by the U.S. Army. DAAL03-83-K-0171 Research partially supported by the NSF. ECES-A5-15449 Research partially supported by the MIT Laboratory for Information and Decision Systems (LIDS).