docstring const getYear(docstring const & key,
bool use_modifier = false) const;
/// \return the year from the bibtex data record for \param key
/// if \param use_modifier is true, then we will also append any
/// modifier for this entry (e.g., 1998b).
docstring const getYear(docstring const & key,
bool use_modifier = false) const;
/// \return the year from the bibtex data record for \param key
/// if \param use_modifier is true, then we will also append any
/// modifier for this entry (e.g., 1998b).