r2b-capitalize-title-stop-words

r2b-capitalize-title-stop-words is a variable defined in `refbib.el'.
Its value is

"the\\|and\\|of\\|is\\|a\\|an\\|of\\|for\\|in\\|to\\|in\\|on\\|at\\|by\\|with\\|that\\|its"

Documentation:
Words not to be capitalized in a title (unless the first word).