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Brockhaus-1809: Das Hysteron-proteron
Brockhaus-1837: Hysteron Proteron
Brockhaus-1911: Hysteron proteron
Eisler-1904: Hysteron Proteron
Herder-1854: Hysteron-Proteron
Meyers-1905: Hýstĕron prótĕron
Pierer-1857: Hystĕron protĕron