Concerning collections of cuttings of connected point sets
Gordon Thomas Whyburn · Bulletin of the American Mathematical Society · 1929
308, and earlier papers by the same authors referred to therein.t See P. Urysohn, Sur la ramification des lignes Cantoriennes, Comptes Rendus, vol.175 (1922), p. 481.t See P. Urysohn, Über im kleinen zusammenhitngende Kontinua, loc.cit.; and R. L. Moore, Concerning triods in the plane and the junction points