1. DIRECT VERSUS INTERMEDIATE PATHWAYS IN INFECTIONS OF THE MASTOID
2. Nitti F., Bovet D.: Quoted by Long, P. H. and Bliss, Eleanor A. The Clinical and Experimental Use of Sulfanilamide, Sulfapyridine and Allied Compounds. The Macmillan Company, New York, 1939, Chap. 2, p. 16.