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A general description is here.
Formatting and printing of bibliography entries (‘bibentry’) is more flexible and better documented. Apart from setting ‘options(citation.bibtex.max = 99)’ you can also use ‘print(<citation>, bibtex=TRUE)’ (or ‘format(..)’) to get the BibTeX entries in the case of more than one entry. This also affects ‘citation()’. Contributions to enable ‘style = "html+bibtex"’ are welcome.