Siemons, Johannes (1984) 2-Designs and a differential equation. Journal of Geometry, 22 (2). pp. 178-182. ISSN 0047-2468
Siemons, Johannes (1984) Permutation groups on unordered sets I. Archiv der Mathematik, 43 (6). pp. 483-487. ISSN 0003-889X
Siemons, Johannes (1984) Regularity in a graph. In: Proceedings of the conference on combinatorial and incidence geometry: principles and applications (La Mendola, 1982). Rend. Sem. Mat. Brescia, 7 . Vita e Pensiero, Milan, pp. 603-607.
Siemons, Johannes (1984) Steiner systems whose automorphism group is doubly homogeneous:Istanbul. UNSPECIFIED.
Siemons, Johannes (1984) Tactical decompositions in finite incidence structures. Istit. Lombardo Accad. Sci. Lett. Rend. A, 118. 191-202 (1987).