Analysis of information sources in references of the Wikipedia article "Astronomisk enhed" in Danish language version.
Use standard abbreviations for SI... and natural units (e.g., au, pc, cm).
The XXVIII General Assembly of International Astronomical Union … recommends … 5. that the unique symbol "au" be used for the astronomical unit.
"The units of length/distance are Å, nm, µm, mm, cm, m, km, au, light-year, pc.
Use standard abbreviations for SI... and natural units (e.g., au, pc, cm).