https://elib.psu.by/handle/123456789/10843 Mon, 02 Feb 2026 22:40:01 GMT 2026-02-02T22:40:01Z https://elib.psu.by/handle/123456789/24274 Title: _ Authors: _ Sun, 01 Jan 2017 00:00:00 GMT https://elib.psu.by/handle/123456789/24274 2017-01-01T00:00:00Z https://elib.psu.by/handle/123456789/24269 Title: _ Authors: _ Sun, 01 Jan 2017 00:00:00 GMT https://elib.psu.by/handle/123456789/24269 2017-01-01T00:00:00Z https://elib.psu.by/handle/123456789/24267 Title: _ Authors: _ Sun, 01 Jan 2017 00:00:00 GMT https://elib.psu.by/handle/123456789/24267 2017-01-01T00:00:00Z https://elib.psu.by/handle/123456789/24266 Title: _ Authors: _ Thu, 01 Jan 2009 00:00:00 GMT https://elib.psu.by/handle/123456789/24266 2009-01-01T00:00:00Z