D. Betten and R. Riesinger, Parallelisms of PG(3; R) composed of non-regular spreads, Aequationes Math. 81, 227-250, 2011. [OpenAIRE]
 D. Betten and R. Riesinger, Clifford parallelism: old and new definitions, and their use, J. Geometry 103, 31 - 73, 2012. [OpenAIRE]
 D. Betten and R. Riesinger, Collineation groups of topological parallelisms, Adv. in Geometry 14, 175 - 189, 2014. [OpenAIRE]
 D. Betten and R. Riesinger, Automorphisms of some topological regular parallelisms of PG(3; R), Results in Math. 66, 291-326, 2014. [OpenAIRE]
 D. Djocovi´c: The union of compact subgroups of a connected locally compact group, Math. Zeitschr. 158, 99 - 105, 1978.
 R. Ku¨hne and R. Lo¨wen, Topological projective spaces, Abh. Math. Sem. Univ. Hamb. 62, 1 - 9, 1992.
 R. Lo¨wen, A characterization of Clifford parallelism by automorphisms, arXiv:1702.03328; Innovations in Incidence Geometry, to appear.
 H. Salzmann, D. Betten, T. Grundho¨fer, H. H¨ahl, R. Lo¨wen, M. Stroppel, Compact projective planes, Berlin etc.: de Gruyter 1995.
Rainer Lo¨wen, Institut fu¨r Analysis und Algebra, Technische Universit¨at Braunschweig, Universit¨atsplatz 2, D 38106 Braunschweig, Germany