SUMMARY This article is available only in Slovak without a summary.
Doctoral research
SUMMARY This article is available only in Slovak without a summary.
SUMMARY This article is available only in Slovak without a summary.
SUMMARY This article is available only in Slovak without a summary.
SUMMARY This article is available only in Slovak without a summary.
SUMMARY This article is available only in Slovak without a summary.
SUMMARY This article is available only in Slovak without a summary.
SUMMARY This article is available only in Slovak without a summary.
SUMMARY This article is available only in Slovak without a summary.