A minimum-problem on areas of inscribed and circumscribed polygons of a circle
Compositio Mathematica, Tome 8 (1951), pp. 61-67. 
@article{CM_1951__8__61_0,
     author = {Acz\'el, John and Fuchs, Ladislas},
     title = {A minimum-problem on areas of inscribed and circumscribed polygons of a circle},
     journal = {Compositio Mathematica},
     pages = {61--67},
     publisher = {Kraus Reprint},
     volume = {8},
     year = {1951},
     mrnumber = {33549},
     zbl = {0035.38401},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1951__8__61_0/}
}
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%A Fuchs, Ladislas
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%D 1951
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%F CM_1951__8__61_0
Aczél, John; Fuchs, Ladislas. A minimum-problem on areas of inscribed and circumscribed polygons of a circle. Compositio Mathematica, Tome 8 (1951), pp. 61-67. http://archive.numdam.org/item/CM_1951__8__61_0/