The centroid and circumcentre of a plane convex set
Compositio Mathematica, Volume 21 (1969) no. 2, p. 125-136
@article{CM_1969__21_2_125_0,
author = {Eggleston, H. G.},
title = {The centroid and circumcentre of a plane convex set},
journal = {Compositio Mathematica},
publisher = {Wolters-Noordhoff Publishing},
volume = {21},
number = {2},
year = {1969},
pages = {125-136},
zbl = {0179.27401},
mrnumber = {244859},
language = {en},
url = {http://www.numdam.org/item/CM_1969__21_2_125_0}
}

Eggleston, H. G. The centroid and circumcentre of a plane convex set. Compositio Mathematica, Volume 21 (1969) no. 2, pp. 125-136. http://www.numdam.org/item/CM_1969__21_2_125_0/

H.G. Eggleston [1] An extremal problem concerning the centroid of a plane convex set. Colloquium on Convexity 1965. p 68. | Zbl 0147.22201