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On free Minkowski planes -- Rigidity in the geometry of involutory elements of a group -- Ein Trennungsaxiom in der Orthogonalgeometrie und eine Charakterisierung der reellen Ebene -- Applications of the theory of surfaces to the theory of graphs -- Central translation S-space -- Systems of quadrics through a general variety of Segre and their reduction to irreducible parts [2] -- Generators and relations for classical groups -- Some combinational problems in geometry -- Über die algorithmische Lösung des Steinitzproblems einer inneren Kennzeichnung polytopaler Sphären -- Regular permutation geometries -- On characterisations of kinematic spaces by parallelisms -- On realizations of vector products by polynomials which are identities for matrix rings -- On the construction of archimedean orders of a free plane -- Rectangular spaces -- On sharply 2-transitive permutation sets -- Dimension of nearaffine spaces -- Generating cryptomorphic axiomatizations of matroids -- Partial planes with exactly two complete parallel classes -- A problem of free mobility -- A unified approach to Miquel's theorem and its degenerations -- Automorphisms of laguerre-geometry and cone-preserving mappings of metric vector spaces -- Bounds for the number of solutions of certain piecewise linear equations -- Zur Translationstransitivität in affinen Hjelmslevebenen -- Near-rings with right inverse property -- On reflections in Minkowski-planes -- On the space of Riemannian metrics on surfaces and contact manifolds -- Circles on surfaces in the euclidean 3-space -- Classes caracteristiques principales et secondaires -- Deformation theory and stability for holomorphic foliations -- Vanishing theorems and stability of complex analytic foliations -- Power series expansions, differential geometry of geodesic spheres and tubes, and mean-value theorems -- On distance-decreasing collineations -- On a parametrix form in a certain V-submersion -- Stable and unstable motions on surfaces -- Vector fields and generalized vector fields on fibered manifolds -- Lie algebras of order 0 on a manifold -- à l'étude de certains systèmes différentiels -- Infinitesimal deformations preserving parallel normal vector fields -- Differential Galois theory -- Counterexamples to a conjecture of Rene Thom -- Conformal invariants on almost Hermitian manifolds -- Conformal changes of almost contact metric structures.