Visualization system for the measurement of size and sphericity of char particles under combustion conditions. - Adamczyk, Wojciech P.; Szlęk, Andrzej; Klimanek, Adam; Białecki, Ryszard A.; Węcel, Gabriel; Katelbach-Wozniak, Anna; Sładek, Slawomir; Ditaranto, Mario; Haugen, Nils Erland L. (Powder Technology, 2016)