Analysis of information sources in references of the Wikipedia article "Anna Leopoldovna" in English language version.
'Nine days after Alexei's birth, on 19 March 1746, Anna Leopoldovna died of post-natal fever at the age of twenty-seven in Kholmogory'
'Nine days after Alexei's birth, on 19 March 1746, Anna Leopoldovna died of post-natal fever at the age of twenty-seven in Kholmogory'
