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| 1 | .., .. // . 89. .: , 2021. .5-44. DOI: https://doi.org/10.25728/ubs.2021.89.1 (: 1862, : 1733, : 14)
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| 2 | .., .. // . 89. .: , 2021. .45-72. DOI: https://doi.org/10.25728/ubs.2021.89.2 (: 1713, : 434, : 9)
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| 3 | .. - - // . 89. .: , 2021. .73-105. DOI: https://doi.org/10.25728/ubs.2021.89.3 (: 1795, : 657, : 19)
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| 4 | .. // . 89. .: , 2021. .106-122. DOI: https://doi.org/10.25728/ubs.2021.89.4 (: 1838, : 3138, : 20)
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