rmarkdown: how to use multiple bibliographies for a document

Question

[My environment: Win 7 Pro / R 3.2.1 / knitr_1.12.3 / R Studio Version 0.99.892]

I am trying to write an article in .Rmd format using R Studio, Knit ->

Answer 1

For the record: I raised this as an issue for pandoc-citeproc at https://github.com/jgm/pandoc-citeproc/issues/220

It turns out that there were problems in how pandoc-citeproc handles some characters in @{string={}} and non-ASCII characters in .bib files, so what I was trying now works, with hard-coded pathnames, in all the forms I tried.

To make it work more like processing of .Rnw files via Latex/bibtex it would be nice to be able to use something like

bibliography: 
  - `r system(kpsewhich statistics.bib)`
  - `r system(kpsewhich graphics.bib)`

Those commands do find the right files in an R session, but not from a YAML header.