On absolutely extremal points
Compositio Mathematica, Tome 59 (1986) no. 1, pp. 51-56. 
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Glasner, S.; Maon, D. On absolutely extremal points. Compositio Mathematica, Tome 59 (1986) no. 1, pp. 51-56. http://archive.numdam.org/item/CM_1986__59_1_51_0/

[1] S. Glasner: Absolutely extremal points in minimal flows. Compositio Math. 55 (1985) 263-268. | Numdam | MR | Zbl

[2] S. Glasner and D. Maon: An inverted tower of almost 1-1 extensions. Journal d'Analyse Math. Vol 44 (1984/85) 67-75. | MR | Zbl

[3] D. Maon: On the relation N, the obstruction to uniform rigidity. Tel Aviv University.

[4] M. Denker, C. Grillenberger and K. Sigmund: Ergodic theory on compact spaces, Lecture Notes in Mathematics 527. Springer Verlag (1976). | MR | Zbl