An Upper and a Lower Bound Theorem for Combinatorial 4-Manifolds. - Eric Sparla (Discret. Comput. Geom., 1998)

A New Lower Bound Theorem for Combinatorial 2k-Manifolds. - Eric Sparla (Graphs Comb., 1999)

A classification of centrally-symmetric and cyclic 12-vertex triangulations of S2?S2. - Gunter Lassmann; Eric Sparla (Discret. Math., 2000)