write_bib(c("RGtk2", "gWidgets"), file = "R-GUI-pkgs.bib")
write_bib(c("animation", "rgl", "knitr", "ggplot2"))
write_bib(c("base", "parallel", "MASS")) # base and parallel are identical
write_bib(c("rpart", "survival"))
write_bib(c("rpart", "survival"), tweak = FALSE) # original version
# what tweak=TRUE does
str(knitr:::.tweak.bib)
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