"Logique." . . "Mathematics Philosophy." . . "Philosophie des sciences." . . "Logique Collections." . . "Logic, Symbolic and mathematical." . . . . "Lògica matemàtica." . . "Lógica simbólica y matemática." . . "Philosophie Collections." . . "Wiskundige logica." . . "Matemáticas Filosofía." . . "Sciences Philosophie." . . . . "Conceptual notation : And related articles; Transl. and ed. with a biogr. and introd" . . . . . . . . . . . "Bibliography" . "Bibliography"@en . . . . . . . "Conceptual notation and related articles" . . . . . . . . . . . . . . . . . "Conceptual notation, and related articles" . "Conceptual notation, and related articles"@en . . . . . . . "Aritmètica." . . "Logique symbolique et mathématique." . .