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I've made a little bib file with jabref. When i compile it with Texmaker (F11) I obtain:

**This is BibTeX, Version 0.99d (MiKTeX 2.9) The top-level auxiliary file:   
prueba.aux The style file: apalike.bst Database file #1: bibio.bib Warning--I 
didn't find a database entry for "S�nchez" (There was 1 warning)**

The bib file is:

% This file was created with JabRef 2.9.2.
%  Encoding: Cp1252

@BOOK{Sanchez,
  title = {Problemas Resueltos De M\'{e}todos Num\'{e}ricos},
  publisher = {Thomson},
  year = {2006},
  author = {Alicia Cordero Barbero and Jos\'{e} Luis Hueso Pagoaga and Eulalia
    Mart\'{i}nez Molada and Juan Ram\'{o}n Torregrosa S\'{a}nchez},
  pages = {37-69},
  edition = {1},
  isbn = {84-9732-409-9},
  url = {www.paraninfo.es}
}

@BOOK{Cabezas,
  title = {M\'{e}todos Num\'{e}ricos Teor\'{i}a, problemas y pr\'{a}cticas con
    MATLAB},
  publisher = {Pir\'{a}mide},
  year = {2007},
  author = {Juan Antonio Infante Del R\'{i}o and Jos\'{e} Mar\'{i}a Rey Cabezas},
  pages = {435-483},
  edition = {3},
  isbn = {978-84-368-2090-4}
}

In the pdf i don't see Sanchez entry and i see Cabezas entry

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  • 2
    What does the argument of your \cite command look like? Is it maybe \cite{Sánchez}? What happens if you change it to \cite{Sanchez}?
    – Mico
    Commented Oct 28, 2013 at 7:24
  • Oh, thanks!!! must i always add \cite in my latex documents or is there any way to add bibligraphy without add \cite ?
    – Tobal
    Commented Oct 28, 2013 at 7:32
  • 2
    Regarding the question in your follow-up comment: If all entries in your bib file should show up in the References section regardless of whether they're cited explicitly or not, issuing the command \nocite{*} will let you achieve that. If you want to have some selected entries show up in the References while not citing them explicitly, use \nocite{...} with the appropriate keys. Of course, entries that are explicitly \citeed in the body of the text will show up in the References automatically.
    – Mico
    Commented Oct 28, 2013 at 8:07

1 Answer 1

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The warning you have says

I didn't find a database entry for "S�nchez"

which looks very much like an accented character in the key (Sánchez). That's not the same as the entry you show in your database (Sanchez), so unsurprisingly it's not matched.

I'd caution against using accents in keys in general. The 'classic' BibTeX program is 7-bit and while BibTeX8 expands to 8-bit it still doesn't support accents in keys. The BibTeX format essentially defines keys as strictly ASCII, and both the 'classical' tools and alternative parsers may break with other characters in keys.

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