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I'm posting this in case it will help anyone else.

I created the minimal example, but I was rather desperate to get the problem fixed so I did two things which seemed to solve the problem.

Firstly, there was a problem with two of the references having the same author year, which meant that the ...

Hi, I am new to Latex and I am trying to use it to write my phd thesis.

I have a large document linked to a jabref bibliography and I am using natbib .
The preamble is

\documentclass[oneside,12pt]{scrbook}
\usepackage[onehalfspacing]{setspace}
\usepackage[round]{natbib}
\begin{document}
\chapter ...