72. “Experimental Determination of the Pore Size of Filters” “Experimentelle Bestimmung der Kanalweite von Filtern” [Einstein and Mühsam 1923] Completed before 2 July 1923 Published 3 August 1923 In: Deutsche medizinische Wochenschrift 49, no. 31 (1923): 1012–1013.