Abstracts and keywords You can read the abstracts and keywords of the published issues in pdf format. Files for download: 2020 - 1(53) - 2(54) - 3-4(55-56) 2021 - 1(57) - 2(58) - 3(59) - 4(60) 2022 - 1(61) - 2(62) - 3(63) - 4(64) 2023 - 1(65) - 2(66) - 3(67)