RT Journal Article SR Electronic T1 Chemical Condensation Sequence in the Solar Nebula JF Science JO Science FD American Association for the Advancement of Science SP 817 OP 817 DO 10.1126/science.186.4166.817 VO 186 IS 4166 A1 Metz, William D. YR 1974 UL http://science.sciencemag.org/content/186/4166/817.abstract AB