Ушаков, В., V. Ushakov, А. Ершов, and A. Ershov. “On the Guaranteed Estimates of the Area of Convex Subsets of Compacts on a Plane”. Mathematical Game Theory and Applications, Vol. 12, no. 4, Dec. 2020, pp. 112-26, doi:10.17076/mgta_2020_4_28.