Cvetanov, Genadi, and Tsanko Karadzhov. 2021. “GEOMETRIC SYNTHESIS OF INVOLUTE PLANETARY GEARS WITH CONNECTED GEAR WHEELS OF TYPE 2K-H”. ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference 3 (June): 49-53. https://doi.org/10.17770/etr2021vol3.6643.