Özme, Şencan, et al. “Detection of Intracardiac Left-to-Right Shunts in Children by Contrast Echocardiography and the Radionuclide Technique”. The Turkish Journal of Pediatrics, vol. 32, no. 3, July 1990, pp. 183-95, https://doi.org/10.24953/turkjpediatr.1990.3807.