Bosman, M., E. Hoosen, and J. Degiovanni. “Safety and Efficacy of Percutaneous Closure of Perimembranous Ventricular Septal Defects in Children: Review of the Results at Inkosi Albert Luthuli Central Hospital”. SA Heart Journal, vol. 16, no. 1, Apr. 2019, pp. 14-20, doi:10.24170/16-1-3407.