Miłak, Mateusz, et al. “SLUG FLOW VELOCITY ESTIMATION DURING PNEUMATIC CONVEYING OF BULK SOLID MATERIALS BASED ON IMAGE PROCESSING TECHNIQUES”. Informatyka, Automatyka, Pomiary W Gospodarce I Ochronie Środowiska, vol. 9, no. 1, Mar. 2019, pp. 11-14, doi:10.5604/01.3001.0013.0881.