The subsequently listed documents are supplements to the chapter
Iseler, A. (1978). Über richtungsbasierte Relationen in reellen Vektorräumen. In K.Ch. Klauer & H. Westmeyer (Eds.), Psychologische Methoden und soziale Prozesse - Festschrift für Hubert Feger (pp. 80-121). Lengerich: Pabst.
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Documents
A Systematic Account of Direction-Based Relations in Real Vector Spaces (extended version of the appendix, including proofs.) (pdf): 164 (evy): 172