Amils R, Sanz JL, Ramírez L, Ureña D, Marín I, Pisabarro AG
(1989).
The use of functional analysis of the ribosome as a tool to determine archaebacterial phylogeny.
Leffers H, Garrett RA, Ostergaard L, Kjems J, Larsen N
(1987).
Evolutionary relationships amongst archaebacteria. A comparative study of 23 S ribosomal RNAs of a sulphur-dependent extreme thermophile, an extreme halophile and a thermophilic methanogen.