1. A History of Urology in Egypt;Bitschai,1956
2. A prosthetic ureter in the dog;Block;Trans Am Soc Artif Intern Organs,1977
3. Hepperlen TW, Mardis HK, Malashock E, et al: Spontaneous breakage of polyethylene double pigtail ureteral stents (abstract). Proceedings of American Urological Association, 1982, p 198
4. Evaluation of polymeric materials for endourologic devices: emerging importance of hydrogels;Mardis;Semin Intervent Radiol,1987
5. Polyethylene double-pigtail ureteral stents;Mardis;Urol Clin North Am,1982