Szukana fraza: [Abstract = "There were the years when only 2\-3 academic centres were scientifically active and there were only a few independent researchers. Nowadays \- apart from many people\/laboratories\/departments providing only teaching services in this area \- there are almost ten scientific teams \(recognized in Poland\) conducting the research and over 20 independent researchers who systematically publish their works on the subjects. What is more, there is a large group of assistant professors and PhD students who undertake previously identified problems in a different way or seek new, sometimes niche topics."]

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