Search for "σ-holes" in Full Text gives 3 result(s) in Beilstein Journal of Organic Chemistry.
Beilstein J. Org. Chem. 2023, 19, 1171–1190, doi:10.3762/bjoc.19.86
Beilstein J. Org. Chem. 2023, 19, 317–324, doi:10.3762/bjoc.19.27
Beilstein J. Org. Chem. 2020, 16, 78–87, doi:10.3762/bjoc.16.10