Search for "reductive azo condensation" in Full Text gives 2 result(s) in Beilstein Journal of Organic Chemistry.
Beilstein J. Org. Chem. 2019, 15, 727–732, doi:10.3762/bjoc.15.68
Beilstein J. Org. Chem. 2018, 14, 2799–2804, doi:10.3762/bjoc.14.257