TY JOUR TI Justification of the Principle for Constructing a High-Latitude Gyro Station KW gyro station KW geodetic underground surveys KW true azimuth KW true meridian KW laser gyroscope KW high-latitude geodesy JO Izvestia Vuzov. Geodesy and Aerophotosurveying AU Kaverin, A.P. PY 2025 IS 69 PB MIIGAiK