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Brockhaus-1911: In optima forma · Pro forma · Forma · In forma
DamenConvLex-1834: Pro forma
Herder-1854: Pro forma · In forma
Meyers-1905: Optĭma forma · Pro forma · In optĭma forma · Forma · In forma
Pierer-1857: Pro forma · In optĭma forma · In forma consuēta