On absolutely extremal points
Compositio Mathematica, Volume 59 (1986) no. 1, p. 51-56 
@article{CM_1986__59_1_51_0,
     author = {Glasner, Shmuel and Maon, D.},
     title = {On absolutely extremal points},
     journal = {Compositio Mathematica},
     publisher = {Martinus Nijhoff Publishers},
     volume = {59},
     number = {1},
     year = {1986},
     pages = {51-56},
     zbl = {0596.54036},
     mrnumber = {850120},
     language = {en},
     url = {http://www.numdam.org/item/CM_1986__59_1_51_0}
}

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

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

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