* {{en}} « [https://www.clg2016.org/documents/CLG2016-Schlaudt.pdf Signs, arbitrary or operational? Lessons from studies on algebraic logic and planned languages in the work of Louis Couturat] » per Oliver Schlaudt | * {{en}} « [https://www.clg2016.org/documents/CLG2016-Schlaudt.pdf Signs, arbitrary or operational? Lessons from studies on algebraic logic and planned languages in the work of Louis Couturat] » per Oliver Schlaudt |