1. Adeleke, S.A., Neumann, P.M.: Relations related to betweenness: their structure and automorphisms, Mem. Amer. Math. Soc. 131 (163), viii + pp. 125 (1998)
2. Altwegg, M.: Zur Axiomatik der teilweise geordneten Mengen. Commentarii Mathematici Helvitici 24, 149–155 (1950)
3. Bankston, P.: When Hausdorff continua have no gaps, Top. Proc. (to appear)
4. Bankston, P.: The antisymmetry betweenness axiom and Hausdorff continua (in preparation)
5. Birkhoff, G.: Lattice Theory, 3rd edn. Colloquium publications, Amer. Math. Soc, Providence, R.I (1995). (Originally published in 1948.)