[1] D. Betten and R. Riesinger, Generalized line stars and topological parallelisms of the real projective 3-space. J. Geometry 91, 1-20, 2008.

[2] D. Betten and R. Riesinger, Parallelisms of PG(3; R) composed of non-regular spreads, Aequationes Math. 81, 227-250, 2011.

[3] D. Betten and R. Riesinger, Collineation groups of topological parallelisms, Adv. in Geometry 14, 175 - 189, 2014.

[4] D. Betten and R. Riesinger, Automorphisms of some topological regular parallelisms of PG(3; R), Results in Math. 66, 291-326, 2014.

[5] D. Betten, Topological parallelisms of PG(3, R): outline of the classification, Manuscript.

[6] K. Iwasawa, On some types of topological groups, Annals of Math. 50, 507 - 558, 1949.

[7] R. Ku¨hne and R. Lo¨wen, Topological projective spaces, Abh. Math. Sem. Univ. Hamb. 62, 1 - 9, 1992.

[8] R. Lo¨wen, A characterization of Clifford parallelism by automorphisms, in preparation.

[9] H. Salzmann, D. Betten, T. Grundho¨fer, H. H¨ahl, R. Lo¨wen, M. Stroppel, Compact projective planes, Berlin etc.: de Gruyter 1995.

Dieter Betten, Mathematisches Seminar der Universit¨at, Ludewig-Meyn-Str. 4, D 24108 Kiel, Germany Rainer Lo¨wen, Institut fu¨r Analysis und Algebra, Technische Universit¨at Braunschweig, Pockelsstraße 14, D 38106 Braunschweig, Germany