EDIT

ref #6752 strictly use VerbatimTimePeriod where possible

ref #7238 rename lastName and firstName

cleanup

cleanup

fix #6662 adapt person formatting, put initials to end

ref #6636: try to fix test for RIS import

adapt test

ref #6636 handle Books correctly in RIS import

ref #6636 further improvements to RIS import

ref #6636 first running version of RisReferenceImport, some important tags are still missing