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3: Kalff R, Kocks W, Pospiech J, Grote W. Clinical outcome after head injury in children. Childs Nerv Syst. 1989 Jun;5(3):156-9. PubMed PMID: 2758428.

4: Kalff R, Clar HE, Bamberg M, Holldack J. Tumors of the pineal region in children and adolescents. Acta Neurochir Suppl (Wien). 1985;35:119-22. PubMed PMID: 3867253.

5: Kalff R, Braun W. [Chronic subdural hematoma–operative treatment in 77 patients with burr trepanation]. Zentralbl Neurochir. 1984;45(3):210-8. German. PubMed PMID: 6506932.