If the application is filed by reference to a previously filed application according to Rule 40(1)(c) (see A‑II, 4.1.3.1), where no translation is required, the certified copy of the previously filed application required under Rule 40(3) must satisfy the physical requirements. If the previously filed application is not in an official language of the EPO, only the translation required under Rule 40(3) must satisfy the physical requirements, provided that the authenticity of the contents of the original is not impugned and that the original is of sufficient quality to allow good reproduction (Rule 49(12)).