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@article{bb134901,
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@article{bb134902,
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@article{bb134903,
        AUTHOR = "Balodis, J. and Normand, M. and Varna, I.",
        TITLE = "Extreme Solar Events' Impact on GPS Positioning Results",
        JOURNAL = RS,
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@article{bb134904,
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        TITLE = "Carrier Phase-Based Precise Heading and Pitch Estimation Using a
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        NUMBER = "18",
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@article{bb134905,
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        NUMBER = "18",
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@article{bb134906,
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        BIBSOURCE = "http://www.visionbib.com/bibliography/active682gps1.html#TT130920"}

@article{bb134907,
        AUTHOR = "Gao, W. and Zhao, Q. and Meng, X.L. and Pan, S.",
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        BIBSOURCE = "http://www.visionbib.com/bibliography/active682gps1.html#TT130921"}

@article{bb134908,
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@article{bb134909,
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@article{bb134910,
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@article{bb134911,
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@article{bb134912,
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the IRI-2016 Model over China",
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@article{bb134913,
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@article{bb134914,
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@article{bb134918,
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@article{bb134921,
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