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3. Hypoprothrombinemia and liver function. Surg.;Ziffren;Gynec. & Obst.,1942
4. Prothrombin in liver disease. A clinical evaluation of the two stage method;Mann;Gastroenterology,1948
5. Prothrombinbestimmungsverfahren als Leberfunctionspruefung;Perlick;Ztschr. f. d. ges. exper. Med.,1951