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Using biblatex with Elsevier’s cas-dc and cas-sc classes

In els-cas-templates v2.1, the documentation says biblatex + biber is recommended. However, if we try to use biblatex, the compilation fails. This is because the cas-sc and cas-dc use a length variable that is neither defined in biblatex nor in cas-sc/cas-dc. That length variable is bibsep. It is defined by natbib, which is incompatible with biblatex.

The solution is simple. Just define bibsep in our document’s preamble:

\makeatletter                                                                   
\newlength{\bibsep}{\@listi \global\bibsep\itemsep \global\advance\bibsep by\parsep}
\makeatother                                                                    

Then we should be able to discard natbib and use biblatex.

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