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Thank you Stefan, your solution works up to the first subsubsection heading. After that, all section, subsection and subsubsection headings are followed by a dot.

In fact, the idea is to turn the subsubsection heading into an inline heading (explained at http://www.golatex.de/viewtopic,p,63257.html ...

How can I add a dot after the subsubsection headings without using the Titlesec package?

This post is similar to http://latex-community.org/forum/viewto ... 47&t=20564 but only asks for adding a dot after the subsubsection's title.

Hello Stefan,

Could you give a hint on how to adapt this to subsubsection's only ?

That is, a dot should be inserted after the title of a subsubsection, but not on higher levels such as a section or subsection.