On Scalability of Rough Set Methods. - Piotr Kwiatkowski; Sinh Hoa Nguyen; Hung Son Nguyen (IPMU (1), 2010)

Microwave Frequency Doubler with Improved Stabilization of Output Power. - Piotr Kwiatkowski; Michal Kniola; Zenon Szczepaniak (Sensors, 2023)