RT Journal Article SR Electronic T1 Seamans, Zarb, Anders & Company JF Science JO Science FD American Association for the Advancement of Science SP 1189 OP 1189 DO 10.1126/science.186.4170.1189-a VO 186 IS 4170 A1 G., R. YR 1974 UL http://science.sciencemag.org/content/186/4170/1189.2.abstract AB