Non-Existence of isomorphisms between certain unitals. - Theo Grundhöfer; Boris Krinn; Markus J. Stroppel (Des. Codes Cryptogr., 2011)

A non-classical unital of order four with many translations. - Theo Grundhöfer; Markus J. Stroppel; Hendrik Van Maldeghem (Discret. Math., 2016)

Embeddings of unitals such that each block is a subline. - Theo Grundhöfer; Markus J. Stroppel; Hendrik Van Maldeghem (Australas. J Comb., 2021)

Linear spaces embedded into projective spaces via Baer sublines. - Theo Grundhöfer; Markus J. Stroppel; Hendrik Van Maldeghem (Comb. Theory, 2022)