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Yanan Yang and  Zhigang Wang and  Xiang Chen,  An Optimization of Orbital Transfer for Spacecrafts with Finite-thrust Based on Legendre Pseudospectral Method.   journal   = {International Journal of Mathematical, Computational, Physical, Electrical and Computer Engineering}, [online]. World Academy of Science, Engineering and Technology. August 2012, vol. 68(8). 1041 - 1045[viewed 23 July 2018]. Available from: http://waset.org/publications/6319.