Barba, L. ., J. . Blancas, M. . Cappa, M. . Cura, G. Crisci, D. . De Angelis, D. Miriello, A. Pecci, and H. B. Yavuz. “Georadar Study of Early Structures under the Hagia Sofia, Istanbul, Turkey”. Archaeologia Polona, vol. 53, Jan. 2015, pp. 248-51, https://journals.iaepan.pl/apolona/article/view/321.