Search for "γ-lactams" in Full Text gives 28 result(s) in Beilstein Journal of Organic Chemistry.
Beilstein J. Org. Chem. 2010, 6, 1167–1173, doi:10.3762/bjoc.6.133
Beilstein J. Org. Chem. 2010, 6, No. 48, doi:10.3762/bjoc.6.48
Beilstein J. Org. Chem. 2009, 5, No. 44, doi:10.3762/bjoc.5.44