"Recursie." . . "MATHEMATICS General." . . "Logique mathématique." . . . . "Logique symbolique et mathématique." . . "Lógica simbólica." . . "Verzamelingen (wiskunde)" . . "Logic, Symbolic and mathematical." . . . . . . . . . . . . . . . . . . . . "Logic, sets, and recursion" . . "Electronic books"@en . . . "Logic, sets and recursion" . . "Logic, sets, and recursion"@en . . . . .