Topyła, Weronika Sandra, et al. “Non Symptomatic Atrial Septal Defect Venosus Type IVC – SV Coexistent With Non-Obstructed Foramen Ovale in 78 Years Old Patient – a Case Report”. Journal of Education, Health and Sport, vol. 7, no. 12, Dec. 2017, pp. 40-44, https://apcz.umk.pl/JEHS/article/view/5098.