Is Ligation of Azygos Vein Necessary in Primary Repair of Tracheoesophageal Fistula with Esophageal Atresia? - Upadhyaya, V D; Gangopadhyaya, A N; Gopal, S C; Upadhyaya, A; Sharma, S P; Gupta, D K; Kumar, V; Pandey, A (European Journal of Pediatric Surgery, 2007)