[1] Univ Illinois, Comp Sci Elect & Comp Engn & Informat Sci, Champaign, IL 61820 USA
[2] Univ Edinburgh, Software Sustainabil Inst, Edinburgh, Midlothian, Scotland
[3] Univ Edinburgh, Edinburgh Parallel Comp Ctr, Edinburgh, Midlothian, Scotland
[4] Univ Virginia, Charlottesville, VA 22903 USA
[5] DataCite, Hannover, Germany
[6] Univ Calif San Diego, La Jolla, CA 92093 USA