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General Relativity and Gravitation > 2019 > 51 > 6 > 1-17
General Relativity and Gravitation > 2016 > 48 > 12 > 1-14
Astrophysics and Space Science > 2014 > 351 > 2 > 401-406
Acta Astronautica > 2012 > 78 > Complete > 99-108
General Relativity and Gravitation > 2001 > 33 > 9 > 1535-1548