1. Cancer of the bladder. Fragments forming urethral plugs discharged in the urine. Concentric colloid bodies;Sanders;Edinb Med J,1864
2. Portions of cancerous growth passed by urethra;Dickinson;Trans Pathol Soc Lond,1869
3. The diagnosis of tumors of the bladder by- microscopical examination;Ferguson,1892
4. A study of prostatic secretion and its relation to malignancy;Mulholland,1931
5. Urine sediment smears as a diagnostic procedure in cancers of the urinary tract;Papanicolaou;Science,1945