Dipierro, S., A. Dzhugan, N. Forcillo, and E. Valdinoci. “Enhanced Boundary Regularity of Planar Nonlocal Minimal Graphs and a Butterfly Effect”. Bruno Pini Mathematical Analysis Seminar, vol. 11, no. 1, Jan. 2020, pp. 44-67, doi:10.6092/issn.2240-2829/10585.