1. D'Espine and Piso: Quoted by Porter and Carter.7
2. Steffen: Quoted by O. T. Schultz.5 Tumors of Infancy and Childhood in Abt's Pediatrics 8: 707, W. B. Saunders Co.
3. MALIGNANT TUMORS OF THE KIDNEY IN INFANCY AND CHILDHOOD
4. Schultz, O. T.: Tumors of the Kidney, in Abt's Pediatrics 4: 1009, W. B. Saunders Co.