# something dumb on bibtex entry format,

David Carlisle d.p.carlisle at gmail.com
Tue Jan 12 17:13:51 CET 2021

\} is the latex syntax for \the character } so in fields taking tex streams
you have a literal } character and a missing } to match the {  at the
beginning.
in fields taking numeric entries it's again a missing closing brace and
then a spurious } in the date I would expect.
actually what happens is that bibtex takes this as a literal \ so the
generated bbl file has

\newblock Boston, MA, USA, 2015-09-08 00:00:00 2015. John Wiley \& Sons,
Ltd \.

but \. is the accent command  and the argument here is the \par from the
following blank line so latex gives the error

! Paragraph ended before \OT1\. was complete.

same with the month field teh \ is just passed to latex but here you get

\newblock Boston, MA, USA, 2015-09-08 00:00:00 \ 2015. John Wiley \& Sons,
Ltd.

so you get the safe \   rather than \.{\par} just by accidental chance of
this bib style.  If the bib style had put a full stop rather than a space
after the date you would have had the same error as before.

On Tue, 12 Jan 2021 at 15:59, Mike Marchywka <marchywka at hotmail.com> wrote:

> I'm finally moving my bibtex scraping script to c++ and cleaning up a lot
> of stuff. I validate a foreign or scraped bibtex entry using latex run on
> a test document and my own parser. Its unlikely my parser conforms to
> bibtex requirements exactly so I want to do both. I found what appears
> to be an old test case and it still does not make sense. The question
> seems to be about backslashes preceding a terminating right brace.
> Sometimes they are ok, others not. The test files are xxx.tex and xxx.bib
> as shown below.  If I put a backslash on the "month" line before the right
> brace
> it seems to work ( originally there was an abstract entry with the problem
> but
> I deleted it for space and clarity ),
>     month = {2015-09-08 00:00:00 \},
>
> However, doing it on the publisher line fails,
>
>     publisher = {John Wiley \& Sons, Ltd \},
>
>
>
>
>  cat /tmp/xxx.tex
> \documentclass{article}
> \begin{document}
> \nocite{*}
> \bibliographystyle{plain}
> \bibliography{xxx}
> \end{document}
> marchywka at happy:/home/documents/cpp/proj/toobib/junk$cat /tmp/xxx.bib > % programmatically fixed probably bu toobib > % loaded from bbb written on 2019-11-02:17:33:45 > %0 prior 0 > @inproceedings{18538, > address = {Boston, MA, USA}, > author = {Silva, J. C. and Aroso, I. M. and Mano, F. and > S{\'a}-Nogueira, I. and Barreiros, S. and Reis, R. L. and Paiva, A. and > Duarte, A. R. C.}, > doi = {10.1089/ten.tea.2015.5000.abstracts}, > journal = {Tissue Engineering Part A}, > keywords = {Drug delivery systems, green chemistry, Therapeutic deep > eutectic solvents}, > month = {2015-09-08 00:00:00 }, > publisher = {John Wiley \& Sons, Ltd }, > title = { Therapeutic deep eutectic solvents as solubility enhancers > fordifferent active pharmaceutical ingredients}, > url = { > http://online.liebertpub.com/doi/full/10.1089/ten.tea.2015.5000.abstracts > }, > year = {2015} > } > marchywka at happy:/home/documents/cpp/proj/toobib/junk$
>
>
> I run 3 times, latex, bibtex, and latex again, then grep for error,
> output, and warning
> giving the following lines in the two cases,
>
> No pages of output .
> Warning - - empty booktitle in 18538
> ( There was 1 warning )
> . / xxx . bbl : 9 : = = > Fatal error occurred , no output PDF file
> produced !
>
> versus,
>
> =No pages of output .
> Warning - - empty booktitle in 18538
> ( There was 1 warning )
> LaTeX Warning : Label ( s ) may have changed . Rerun to get cross -
> references right .
> Output written on xxx . pdf ( 1 page , 28937 bytes ) .
>
>
> What is the backslash before the brace supposed to do or is there
> something silly I'm
> missing? Thanks.
>
>