@article {Sar21, title = {A sufficient criterion to determine planar self-Cheeger sets}, journal = {J. Convex Anal.}, volume = {28}, number = {3}, year = {2021}, pages = {951--958}, url = {https://www.heldermann.de/JCA/JCA28/JCA283/jca28055.htm}, author = {Saracco, G.} }