1. Lybomir Lazov (2013) "MARKING OF PRODUCTS OF STRUCTURAL STEEL WITH COATINGS" - Contemporary Materials - 2013 - Savremeni materijali
(https://ekonferencije.com/sr1/rad/marking-of-products-of-structu/2146)

2. Lybomir Lazov (2011) "A STUDY OF THE INFLUENCE OF THE NUMBER OF REPETITIONS AND DEFOCUSING ON THE LASER MARKING OF PRODUCTS FROM TOOL STEEL" - Contemporary Materials - 2011 - Savremeni materijali
(https://ekonferencije.com/sr1/rad/a-study-of-the-influence-of-th/760)

3. Lybomir Lazov (2011) "OPTIMIZATION OF THE PROCESS OF LASER MARKING OF PRODUCTS FROM TOOL STEEL" - Contemporary Materials - 2011 - Savremeni materijali
(https://ekonferencije.com/sr1/rad/optimization-of-the-process-of/759)