RT Journal Article SR Electronic T1 DOD Lists Critical Technologies JF Science JO Science FD American Association for the Advancement of Science SP 1543 OP 1543 DO 10.1126/science.243.4898.1543 VO 243 IS 4898 A1 NORMAN, COLIN YR 1989 UL http://science.sciencemag.org/content/243/4898/1543.abstract AB