List of publications:

  1. Zur algebraischen Kennzeichnung der Halbordnungen projektiver Ebenen. J. Geometry 21 (1983), 33 - 41

  2. Stufen der Archimedizität. PhD Thesis, Dortmund 1984

  3. Über lokalarchimedische Anordnungen projektiver Ebenen. J. Geometry 28 (1987), 7 - 40

  4. Zur Archimedizität projektiver Ebenen über Cartesischen Gruppen. Resultate Math. 9 (1986), 52 - 69.

  5. Über Unterebenen affin-archimedischer Ebenen. Arch. Math. 47 (1986), 185-186

  6. Halbordnungen und Epimorphismen projektiver Ebenen. J. Geometry 34 (1989), 74 - 79

  7. Zur Archimedisierung projektiver Ebenen. Geometriae Dedicata 22 (1987), 87 - 93

  8. Zur multiplikativen Archimedizität in projektiven Ebenen. Geometriae Dedicata 23 (1987). 173-186

  9. Über archimedische Punkte projektiver Ebenen. Resultate Math. 11 (1987), 83 - 96

  10. Eine Kennzeichnung anordnungsfähiger Ternärkörper. J. Geometry 31 (1988), 100 - 113

  11. Über Präordnungen von Ternärkörpern. Abh. Math. Sem. Univ. Hamburg 58 (1988), 5 - 13

  12. Zur Vervollständigung nat&auuml;rlich angeordneter Cartesischer Gruppen. Resultate Math. 12 (1987), 289 - 296

  13. Spaces of orderings and Witt rings of Planar Ternary Rings. J. Pure Applied Algebra 58 (1989), 169 - 180

  14. Über Stellen und Präordnungen von Ternärkörpern. Geometriae Dedicata 27 (1988), 137 - 151

  15. Uniform valuations on planar ternary rings. Geometriae Dedicata 28 (1988), 337-348

  16. with S. Priess-Crampe: Ordered Loops and ordered Planar Ternary Rings. Quasigroups and Loops, Theory and Applications (Editor: O. Chein, H. Pflugfelder, J. D. H. Smith), Heldermann Verlag Berlin, 1990, 445 - 465

  17. Trivialization of fans in division algebras. Arch. Math. 52 (1989), 544-550

  18. Ebenen der Lenz-Barlotti Klasse III.2, die keine Moulton - Ebenen sind. Arch. Math. 53 (1989), 99 - 104

  19. Anordnungsräume und Wittringe projektiver Ebenen. Habilitation thesis, Dortmund 1988/89

  20. On order compatible places of near fields. Resultate Math. 15 (1989), 66 - 74

  21. Some local-global principles for ordered projective planes. Geometriae Dedicata 32 (1989), 59 - 79

  22. The holomorphy rings of planar ternary rings with rational prime field. Abh. Math. Sem. Univ. Hamburg 60 (1990), 1 - 15

  23. Trivialization of fans in planar ternary rings with rational prime field. Aequationes Math. 39 (1990), 149-160

  24. Anordnungsräume unter der Moulton Konstruktion und Ebenen der Lenz Klasse III. J. Geometry 38 (1990), 59-77

  25. Formal power series on cartesian groups and their spaces of orderings. Geometriae Dedicata 36 (1990), 329 - 345

  26. Witt rings of weakly orderable double loops and nearfields. Resultate Math. 17 (1990), 106 - 119

  27. Witt rings and semiorderings of planar ternary rings. Topics in Combinatorics and Graph Theory (ed.: Bodendiek, Henn), Physica Verlag Heidelberg, 1990, 405 - 411

  28. with W.Junkers: Zur algebraischen Kennzeichnung mehrwertiger Halbordnungen. J. Geometry 37 (1990), 95 - 104

  29. Approximation Theorems for Uniform Valuations. Mitt. Math. Gesellschaft Hamburg 12 (1991), 793 - 808

  30. A note on places of quasifields. J. Geometry 40 (1991), 113 - 120

  31. On the existence of special quasifields. Arch. Math. 58 (1992), 92 - 97

  32. On multiple-valued ordered projective planes. J. Geometry 44 (1992), 87 - 101

  33. The Tutte group of projective planes. Geometriae Dedicata 43 (1992), 225 - 231

  34. Semiorderings and localizations of planar ternary rings. Abh. Math. Sem. Univ. Hamburg 62 (1992), 233 - 247

  35. Matroids with coefficients over projective planes. J. Combinatorial Theory, Ser. A, 68 (1994), 53-85

  36. Projectivities, Stabilizers and the Tutte group of projective planes. Res. Math. 25 (1994), 64-78

  37. Topological projective planes and uniform valuations. Geometriae Dedicata 54 (1995), 199-224

  38. Orderings, algebras and projective planes. Expositiones Math. 13 (1995), 3-38

  39. Realization of rank three matroids. Appl. Math. Letters 9 (1996), 55 - 58

  40. with W. Wenzel: Matchings and Δ-Matroids with Coefficients. Advances Applied Math. 17 (1996), 63 - 87

  41. On formally real division algebras and quasifields of rank two. Proceedings of the 4th international congress on Geometry, Thessaloniki 1996, Academy of Athens, Aristotele University of Thessaloniki (1997), 214 - 220

  42. On projective embeddings of partial planes and rank three matroids. Discrete Math. 163 (1997) 67-80

  43. On formally real division algebras and quasifields of finite rank. J. Geometry 61 (1998), 74-82

  44. Oriented rank three matroids and projective planes. European J. of Combinatorics 21 (2000), 347-365

  45. On epimorphisms and projectivities of projective planes. J. Geometry 69 (2000), 149-165

  46. A note on the place topology of projective planes. Geometriae Dedicata 83 (2000), 319-327

  47. with V. Pambuccian: Positive existential definability of parallelism in terms of betweenness in Archimedean ordered affine geometry. Rocky Mountains J. Math. 41 (2011), 1501-1521

  48. with V. Pambuccian: An axiomatic look at the Erdös-Trost problem. J. Geom. 4107 (2016), 379-385