60In this regard, it must be noted that it follows from the Court’s case-law that, in order to state in the manner required the grounds for conducting the review, a party requesting the internal review of an administrative act under environmental law is required to put forward facts or legal arguments of sufficient substance to give rise to serious doubts as to the assessment made in that act by the EU institution or body (see, to that effect, judgment of 12 September 2019, TestBioTech and Others v Commission, C‑82/17 P, EU:C:2019:719, paragraph 69).
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