Geodesic
Two remarks about surfaces
Acta Universitatis Lodziensis. Folia Mathematica, Tome 07 (1995).

Voir la notice de l'article provenant de la source University of Lodz Repository

It is shown that among continuous functions defined on the unit square and non-decreasing with respect to each variable separately there is neither a function with the greatest nor a function with the smallest surface area. 
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Wilczyński, Władysław; Rzepecka, Genowefa. Two remarks about surfaces. Acta Universitatis Lodziensis. Folia Mathematica, Tome 07 (1995). http://geodesic.mathdoc.fr/item/AULFM_1995_07_a2/