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" .."
6
1. $f(R)$-
2.
.., .., .., ..
, 2019 ., 155, . 5, . 847
PDF (270.5K)

3.
.., .., ..
, 2017 ., 152, . 6, . 1271
PDF (498.8K)

4. -
5. -
6.