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APA Citation
Chen, J., Zhang, Y., Wang, J., Yang, S., Dong, D., Wang, J., Qu, W., & Wu, B. (2015). a simplified and unified model of multi-GNSS precise point positioning. Advances in space research, 55(1), 125–134. http://access.bl.uk/ark:/81055/vdc_100025858050.0x00001c