Beiträge zur Algebra und Geometrie Contributions to Algebra and Geometry Vol. 49, No. 1, pp. 147151 (2008) 

Tangent segments in Minkowski planesSenlin WuFaculty of Mathematics, Chemnitz University of Technology, 09107 Chemnitz, GermanyAbstract: A Minkowski plane is Euclidean iff the two tangent segments from any exterior point to the unit circle have the same length. Keywords: Birkhoff orthogonality, Busemann angular bisector, Glogovskij angular bisector, James orthogonality, Minkowski plane, normed plane, Radon plane Classification (MSC2000): 52A10, 46B20, 46C99, 51M04 Full text of the article:
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