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I am using BibTeX and natbib for my citations. In the bibliography the first entry usually starts with [1]. Now I would like to shift all the numbers in the bibliography and text by a certain offset, e.g. 15, so that the first item is called 16 in this document.

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I'm not sure why you want to do this (there are various packages that deal with multiple/subdivided bibliographies), but you could use the etoolbox package to append natbib's definition of the thebibliography environment.




\apptocmd{\thebibliography}{\global\c@NAT@ctr 15\relax}{}{}


  author = {Author, A.},
  year = {2001},
  title = {Alpha},
  author = {Buthor, B.},
  year = {2002},
  title = {Bravo},


Some text \citep{A01,B02}.



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