Search for "trifluoroacetic acid anhydride" in Full Text gives 4 result(s) in Beilstein Journal of Organic Chemistry.
Beilstein J. Org. Chem. 2021, 17, 771–799, doi:10.3762/bjoc.17.67
Beilstein J. Org. Chem. 2017, 13, 2486–2501, doi:10.3762/bjoc.13.246
Beilstein J. Org. Chem. 2014, 10, 2270–2278, doi:10.3762/bjoc.10.236
Beilstein J. Org. Chem. 2011, 7, 678–698, doi:10.3762/bjoc.7.80