1. Pathologische Anatomie;Aschoff,1921
2. Organs in Vertebrates;Balfour;Jour. Anat. and Phys,1876
3. Double Kidney;Braasch;Minnesota Med,1922
4. Pathologic Complications with Duplication of the Renal Pelvis and Ureter (Double Kidney);Braasch;Surg. Gynec. and Obst,1922