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Thank you very much for your quick and clear answer, Johannes!
Moreover, it was nice to get a warm welcome.

I understand why you suggested using \chapter . I don't think it is necessary in my case. Namely, the essays can be separate entities. Sorry for my poor choice of words when I wrote about ...

I have trouble interpreting the copyright related to modification of the files.

I would like to use elsarticle template and class files to create separate pdf files of the essays that I include in my doctoral thesis (the essays have not yet been published in journals). However, I should do some ...