Lazov, L., Teirumnieks, E., Teirumnieka, E., Cacivkin, P., Angelov, N., & Karadzhov, T. (2019). LABORATORY EXERCISE TO DETERMINE CONTRAST IN LASER MARKING OF ARTICLES. SOCIETY. INTEGRATION. EDUCATION. Proceedings of the International Scientific Conference, 1, 331-339. https://doi.org/10.17770/sie2019vol1.3906