View source for Reference:Makula RA:Singer ME:,Biochem. Biophys. Res. Commun.,1978,82,716

{{Reference
|IDs=
&&Methanothermobacter thermautotrophicus&&LBGAAB0N01
&&Methanobacterium formicicum&&LBGAAB0N01
&&Methanospirillum hungatei&&LBGAAB0N01
&&Methanothermobacter thermautotrophicus&&LBGACB0N01
&&Methanobacterium formicicum&&LBGACB0N01
&&Methanospirillum hungatei&&LBGACB0N01
|pubmed=666868
|title=Ether-containing lipids of methanogenic bacteria
|doi=http://dx.doi.org/10.1016/0006-291X(78)90933-6
|comment=This paper also discuss the presence of acid-stable phospholipid di- and tetraethers in M. thermautotrophicus and M. formicicum, probably occurring as phosphonic acid (not a phosphate ester).
}}