Ontoseno, Teddy. “Factors Associated With the Occurrence of Cyanotic Spells in Tetralogy of Fallot Patients”. Paediatrica Indonesiana 35, no. 9-10 (October 8, 2018): 227-30. Accessed January 8, 2025. https://paediatricaindonesiana.org/index.php/paediatrica-indonesiana/article/view/1976.