@article{OezkanAyguen2006,
  author    = {{\c{C}}igdem {\"O}zkan-Ayg{\"u}n},
  title     = {The wells, subterranean passage, tunnels and water systems of Hagia Sophia in Istanbul},
  journal   = {FeRA : Frankfurter elektronische Rundschau zur Altertumskunde},
  volume    = {2006},
  number    = {1},
  pages     = {35 -- 40},
  year      = {2006},
}