| University of Nicolaus Copernicus, Torun |
- “Roman coins found in Sri Lanka”, Departement of Archaeology, 19th October 1993.
- “Greeks in Bactria and India”, Departement of Archaeology, 20th October 1993.
- “Greek kingdoms in Central Asia and India”, Departement of Archaeology, 25th November 2008.
- “Maritime trade in the Indian Ocean: New data”, Departement of Archaeology, 26th November 2008.
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| Museum of Archaeology and Ethnology, Lodz. |
- “Roman coins found in Sri Lanka”, Polish Numismatic Society, 22nd October 1993.
- “Maritime trade in the Indian Ocean: Rome and India”, Polish Numismatic Society, 28th November 2008.
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| University of Warsaw |
- “Roman coins from Sri Lanka and their historical significance”, Department of Archaeology, 25th October 1993.
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| Polish Academy of Sciences, Warsaw |
- “Les Indo-Grecs”, Institut d’Archéologie, 26th October 1993.
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