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Brockhaus-1911: Ultima ratio regum · Ultima Thule · Ratio
Eisler-1904: Recta ratio · Ratio · Ignava ratio
Heiligenlexikon-1858: Gregorius a Prato Regum (97)
Herder-1854: Ratio · Alterna ratio
Meyers-1905: Ultima Thule · Ratĭo
Pierer-1857: Subtrīpla ratio · Triplicata ratio · Ratĭo · Subduplicata ratio