1. Bastnagel, M., Berk, B., Burkard, A., Carpenter, M., Christen, H., & Codd et al. (2003). Systems and methods of comparing product information. US Patent App. 09/728,583
2. Blazewicz, J., Bouvry, P., Kovalyov, M. Y., & Musial, J. (2014). Internet shopping with price sensitive discounts. 4OR - A Quarterly Journal of Operations Research, 12, 35–48.
3. Blazewicz, J., Ecker, K., Pesch, E., Schmidt, G., & Weglarz, J. (2007). Handbook on scheduling: From theory to applications. Berlin, New York: Springer.
4. Blazewicz, J., Kovalyov, M., Musial, J., Urbanski, A., & Wojciechowski, A. (2010). Internet shopping optimization problem. International Journal of Applied Mathematics and Computer Science, 20(2), 385–390.
5. Blazewicz, J., & Musial, J. (2011). E-commerce evaluation: Multi-item internet shopping. optimization and heuristic algorithms. In B. Hu, K. Morasch, S. Pickl, M. Siegle (Eds.), Operations Research Proceedings 2010, Operations Research Proceedings, pp. 149–154. Springer, Berlin Heidelberg