Phylogenetic structure of the prokaryotic domain: The primary kingdoms.

(Order of authorship in the original publication: Woese, Fox.) Woese and Fox discovered a "third kingdom" in microbial life that they called "archaebacteria" (Archaea) as distinct from bacteria and eukaryotes. In their original classification archaebacteria were classified as bacteria.

(Thanks to Juan Weiss for this reference and its interpretation.)

Available from pnas.org at this link.