1. Arnold BF (1987a) Minimax-Prüfpläne für die Prozeßkontrolle. Band 28 der Reihe ?Arbeiten zur Angewandten Statistik?. Physica-Verlag, Heidelberg
2. Arnold BF (1987b) The economic design of¯X-charts used in parallel to control the means of independent quality characteristics. Economic Quality Control, Technical Report No. 8 of the Würzburg Research Group on Quality Control
3. Arnold BF, Collani E v (1987) Economic process control. Statistica Neerlandica 41:89?97
4. Arnold BF, Collani E v (1988) On the robustness of¯X-charts. To appear in: Statistics
5. Collani E v (1981) Kostenoptimale Prüfpläne für die laufende Kontrolle eines normalverteilten Merkmals. Metrika 28:211?236