The discovery of groups of dwarf galaxies in extremely isolated environments provides direct observational evidence of hierarchical assembly at small galactic scales.
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Annibali, F. Structure formation: Satellites of satellites in isolation. Nat Astron 1, 0039 (2017). https://doi.org/10.1038/s41550-017-0039
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DOI: https://doi.org/10.1038/s41550-017-0039
