1. Barlow, C., Lewis, D., Bell, J., Irps, T., Prior, S.D., Erbil, M.A., & Karamanoglu, M. (2010). Developing a low-cost beer dispensing robotic system for the service industry. International Conference on CAD/CAM, Robotics and Factories of the Future, Pretoria.
2. Brijs, T. (2002). Retail market basket analysis: a quantitative modelling approach (PhD Thesis). Limburg University Centre, Belgium.
3. A dendrite method for cluster analysis;Caliński;Communications in Statistics-theory and Methods,1974
4. Carreira, F., Calado, J., Cardeira, C., & Oliveira, P. (2014). Enhanced PCA-based localization using depth maps with missing data. Journal of Intelligent & Robotic Systems, Springer, Published Online.
5. Carreira, F., Canas, T., Silva, A., & Cardeira, C. (2006). I-Merc: A mobile robot to deliver meals inside health services. In Proceedings of the IEEE Conference on Robotics, Automation and Mechatronics. 2006.