"Mathematik." . . . . "Mathematics Textbooks." . . "Problem solving Textbooks." . . "Mathématiques." . . "Problemes i exercicis." . . "Résolution de problèmes." . . "Matemàtica." . . . . . . . . . . . . . "Doing mathematics : an introduction to proofs and problem solving" . "Doing mathematics : an introduction to proofs and problem solving"@en . . . . "Doing mathematics : an introduction to proofs and problem-solving" . . . . . . . "Doing mathematics an introduction to proofs and problem solving"@en .