Combustion of deposits from liquid wastes of sewage – treatment plant / S. SŁUPEK, A. BUCZEK, L. KURCZ, R. SEKUŁA // W: 16\textsuperscript{th} international symposium on Combustion processes : Kazimierz Dolny, 1–5 August 1999 : abstracts / Polish Academy of Sciences. Thermodynamics and Combustion Committee ; Radom Technical University. — Radom : RTU - Publishing House, 1999. — ISBN10: 83-88001-65-5. — S. 147

Flame emissivity of heavy liquid fuel / Stanisław SŁUPEK, Robert SEKUŁA, Andrzej BUCZEK // W: MCS–99 : Mediterranean Combustion Symposium : 20–25 June,1999 Anatalya, Turkey. — [Turkey : s. n.], [1999]. — S. 5

Influence of soot and gaseous components on flame emissivity during combustion of heavy liquid fuel / Stanisław SŁUPEK, Robert SEKUŁA Andrzej BUCZEK // W: Proceedings of the fifth Asia-Pacific international symposium on combustion and energy utilization : Shanghai, October 24–29, 1999 / ed.: Huang Zhao Xiang, Liu Xin. — Chaonei Dajie : Republic of China, 1999. — S. 200–204