Al-Shalchi, Abbas Ahmed, and Mohammed Sahib Al-Khesbak. 2014. “Influence of Pipe-Wall Parameters on Non-Intrusive Planar Capacitive Spatial Filter for Solids Flow Measurement”. Nahrain University College of Engineering Journal 17 (2): 142-50. https://oldjournal.eng.nahrainuniv.edu.iq/index.php/main/article/view/215.