* {{cite journal |last1=Bullard |first1=Theresa |last2=Freudenthal |first2=John |last3=Avagyan |first3=Serine |last4=Kahr |first4=Bart |display-authors=3 |year=2007 |title=Test of Cairns-Smith's 'crystals-as-genes' hypothesis |journal=Faraday Discussions |volume=136 |pages=231–245 |bibcode=2007FaDi..136..231B |doi=10.1039/b616612c |pmid=17955812 }}</ref> | * {{cite journal |last1=Bullard |first1=Theresa |last2=Freudenthal |first2=John |last3=Avagyan |first3=Serine |last4=Kahr |first4=Bart |display-authors=3 |year=2007 |title=Test of Cairns-Smith's 'crystals-as-genes' hypothesis |journal=Faraday Discussions |volume=136 |pages=231–245 |bibcode=2007FaDi..136..231B |doi=10.1039/b616612c |pmid=17955812 }}</ref> |