1. Quality measures in lower GI endoscopy (Katzarov, Z. Dunkov, D. Stoyanova, I. Popadiin, M. Konakchieva, K. Katzarov)
2. Prospective comparative study on ureteroscopy versus shockwave lithotripsy in proximal ureteral stones 5-10mm (K. Petkova, I. Saltirov)
3. Effectiveness and safety of percutaneous nephrolithotripsy in treatment of stones in horseshoe kidney
(P.Petrov, O. Gatsev, S Hristoforov, K.Petkova, I.Saltirov)
4. Percutaneous nephrolithotripsy as monotherapy and in combination with shock wave lithotripsy in the management of staghorn kidney stones (O. Gatsev, P. Petrov, S Hristoforov, K. Petkova, I. Saltirov)
5. Percutaneous nephrolithotripsy and retrograde intrarenal surgery in the management of lower pole renal stones > 15mm (S. Hristoforov, O. Gatsev, P. Petrov, , K. Petkova, I. Saltirov)
6. Transarterial embolization of renal vascular injuries after percutaneous nephrolithotomy (E. Popov, A. Popov, D. Zlatanov, V. Ivanov, N.Stoyanov, K. Ibrachimov)
7. Colon perforation in percutaneous nephrolithotomy: prevention, diagnosis and treatment (K. Davidov, E. Popov, D. Zlatanov, V. Ivanov, N.Stoyanov, K. Ibrachimov)
8. The place of laparoscopic procedures in the treatment of acute peritonitis (B. Atanasov, N. Belev, Ch. Atanasov)
9. Analysis of the learning curve in¤uence on surgical procedures quality and morbidity based on 420 consecutive laparoscopic colorectal operations (N. Belev, B. Atanasov, M. Slavchev, Hr. Kolarov, P. Krastev, G. Dgarov)
10. Laparoscopic-assisted transanal total mesorectal excision with coloanal anastomosis (D. Penchev, P.Ivanov, G. Kotashev, G. Popivanov, W. Kiosev, G. Grigorov, H. Petrov, V. Hristova, V. Mutafchiiski)
11. An unusual presentation of colon perforation following percutaneous nephrolithotomy (E. Popov, A. Popov, D. Zlatanov, V. Ivanov, N. Stojanov)
12. Miniaturized percutaneous nephrolithotomy with modi.ed access sheath with continuous aspiration (I.Saltirov, K. Petkova)