1. Drobler, M. J.: Transitional cell cancer: Upper tracts and bladder. In: Walsh, Gittes, Perlmutter, Stamey (eds): Campbell’s Urology. 5th Edition. Saunders, Philadelphia 1986, pp. 1408–1410.
2. Billroth, T.: Die allgemeine chirurgische Pathologie und Therapie in 51 Vorlesungen. In: Handbuch für Studirende und Aerzte. G. Reimer, Berlin 1889, p. 908.
3. Warren, S., Gates, O.: Multiple primary malignant tumours, a survey of the literature and statistical study.Am. J. Cancer, 16, 1358 (1932).
4. McCredie, M., Stewart, J. H., Ford, J. M.: Analgesics and tobacco as risk factors for cancer of the ureter and renal pelvis.J. Urol., 130, 28 (1983).
5. Jensen, O. M., Knudsen, J. B., McLaughlin, J. K.: The Copenhagen case-control study of renal pelvis and ureter cancer: role of smoking and occupational exposures.Int. J. Cancer, 41, 557 (1988).