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Certificate of SPEKTRA
SINTA-3 Certificate (Please right-click and save image as to save PNG file to your computer)
This work is licensed under a Creative Commons Attribution 4.0 International License.
SINTA-3 Certificate (Please right-click and save image as to save PNG file to your computer)
CERTIFICATE:
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STATISTIC OF SPEKTRA:
This work is licensed under a Creative Commons Attribution 4.0 International License.