2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/69895We present a construction method of BIB-designs from a finite group G and a group of automorphisms Φon G such that |Φ(x)| = |Φ| for all x in G, x <> 0. By using a generalization of the concept of a difference family we can so unify several previous constructions of BIB-designs from planar near-rings.submitted to the proceedings of the nearring conference in Hamburg, 2003CombinatoricsGroup Theory05B05text