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.

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