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4. V. Ph. Zhuravlev, P. K. Plotnikov, RF Patent No. 155046 “A three-component angular velocity meter based on a spherical gyroscope with electrostatic suspension,” MPK G01C 19/00 (2015)
5. P. K. Plotnikov, RF Patent No. 163835 “A three-component angular velocity meter based on a Kovalevskaya spherical gyroscope with an electrostatic suspension,” IPC G01C 19/00 (2016)