Phug lugs Rtsis kyi legs bśad mkhas paʼi mgul rgyan Baiḍūr dkar poʼi do śal dpyod ldan sñiṅ nor : the basic Tibetan treatise on the principles of astrology, astronomy, and calendrical calculations - Sangs-rgyas-rgya-mtsho, Sde-srid, 1653-1705 (Sakya Centre, 1978)