c-Extensions of the Petersen Geometry for M22. - Anna Fukshansky; Corinna Wiedorn (Eur. J. Comb., 1999)

c-Extensions of P- and T-Geometries. - Gernot Stroth; Corinna Wiedorn (J. Comb. Theory A, 2001)

Flag-transitive c-extensions of the F4(2)-building - the amalgams. - Corinna Wiedorn (Eur. J. Comb., 2007)