@TechReport{KE99,
    Author       = "Kulik, L. and Eschenbach, C.",
    Year         = "1999",
    Title        = "{A Geometry of Oriented Curves}",
    Number       = "Report from the project: Axiomatics of Spatial Concepts",
    Institution  = "Department for Informatics, University of Hamburg",
    Address      = "Hamburg, USA",
    Comment      = "TPTPRef"
}