- Research. 1997;337:77–85. Syrmou, E., Tsitsopoulos, P. P., Marinopoulos, D.,
Tsonidis, C., Anagnostopoulos, I., & Tsitsopoulos, P. D.Spondylolysis: A Review...
- Surgeons.
Retrieved 9 June 2013.
Syrmou E,
Tsitsopoulos PP,
Marinopoulos D,
Tsonidis C,
Anagnostopoulos I,
Tsitsopoulos PD (2010). "Spondylolysis: a review...