I use Mendeley to manage my bibliography for my thesis. I add all the papers there and then I have it create a file bibtex to then use in the writing of the thesis. One of the citation I need is Röthlisberger et al., 2000a, since I knew LaTeX would have freaked out if I dared to simply write the ö in the BibTeX file, I edited (using .tex editor on windows) the entry to be
@article{Roth2000,
author = {Regine R{\"{o}}thlisberger and Manuel A. Hutterli and Stefan Sommer and Eric W. Wolff and Robert Mulvaney},
doi = {10.1029/2000JD900264},
issn = {01480227},
issue = {D16},
journal = {Journal of Geophysical Research: Atmospheres},
month = {8},
title = {Factors controlling nitrate in ice cores: Evidence from the Dome C deep ice core},
volume = {105},
year = {2000},
}
Since I'm using natbib (\usepackage[round]{natbib}), the process of citing should be quite straightforward and in the text I used \citep{Roth2000} to call the citation where I needed and... It doesn't work. At all. I tried all the combination to write the ö in that name, with multiple brackets, without brackets, only on the o, all of them. The result is always an error of
!Missing $ inserted.
<inserted text>
$
l.19 R.~R<?>
<?>thlisberger, U...
?
which makes, to me, no sense. I tried to look around and every guide I've found seems to suggest that... this is how you should write it. Am I missing something?
EDIT:
The file I'm trying to make work is as follows
\documentclass[b5paper,11pt,titlepage]{book}
\usepackage[english]{babel}
\usepackage[round]{natbib}
\bibliographystyle{abbrvnat}
\usepackage[T1]{fontenc}
\usepackage[applemac]{inputenc}
\title{Title}
\author{Raffaello Nardin}
\date {October 2021}
\begin{document}
\frontmatter
\tableofcontents
\mainmatter
\chapter{Introduction}
\thispagestyle{empty}
Lorem ipsum dolor sit amet \citep{Roth2000}
\bibliography{Ref}
\end{document}
With Ref being the name of the BibTeX file
