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مقالاتی از پروفسور هلموت کارتسل
Co-Minkowski spaces, their refection structure and K-loops
Automorphisms of Symmetric and Double Symmetric Chain Structures
Webs Related to K-Loops and Reflection Structures
Properties of Auto- and Antiautomorphisms of Maximal Chain Structures and their Relations to i-Perspectivities
Point Symmetric 2-Structures