2021
Sgibnev - Dynamic Geometry at School
    https://www.youtube.com/watch?v=4kqAl3HpMEU
Sgibnev - Top Geogebra Lifehacks ru of 16:37
    https://www.youtube.com/watch?v=njz1at6ZjXQ
2020
Sgibnev - GeoGebra for Teachers
    https://www.youtube.com/playlist?list=PLnnFSS9Rswo3a2TPHcf2jMP2EsV1g7asA
Sgibnev - GeoGebra for Teachers - Dynamic Planimetry
    https://www.youtube.com/watch?v=ZpLI2802pxM
2019
Sgibnev - GeoGebra in 19 min
    https://www.youtube.com/watch?v=z6odxedOwas
    ! 4:30 need to look
    https://drive.google.com/file/d/14MiHHTBCEKau0HT9xVvPbLKhhROKqdKV/view