Export to bibtex loses the field # of Pages
Items of book type when exporting to bibtex do lose field # of Pages, so bibtex translator and .bst file can not make up a complete bibliographic record. Thank you.
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But I can explain why this is important. As you know, most scientific journals offer authors to draw bibliography using .bst file and .bib file. Russian standard requires that the book has the number of pages. .bst file for Russian standard, we create ourselves, and other universities will be able to use it. The only thing is that all the fields available in the Zotero went into export.
numpages or pages
The documentation (PDF) makes it clear that numpages is not standard BibTeX and claims that it borrowed it from BibLaTeX (though, given "pagetotal", I'm not sure if that is the origin). There are only a limited number of other styles that use the numpages field. It isn't in JabRef or other popular BibTeX programs. When there's little agreement on fields, we tend to not export them.
If you export to BibLaTeX, search for "pagetotal" and replace with "numpages", that output should most likely work with your BibTeX BST file. Alternatively, there is a BibLaTeX/Biber style for GOST.
But to be clear: based on how rare the usage is within BSTs and the absence from other BibTeX-based software, I'd prefer to NOT implement this. This isn't a strong preference, though; it shouldn't break anything & others may say I'm underestimating the utility.
ENTRY
{
...
pages
....
numpages
...
}
For type "book" they process both entries, but "numpages" is beeing processed for type "book" more correctly, as stated in the standard.