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General Relativity and Gravitation > 2018 > 50 > 3 > 1-7
Computational Mathematics and Mathematical Physics > 2017 > 57 > 6 > 953-955
Wave Motion > 2010 > 47 > 8 > 496-507
Computers and Mathematics with Applications > 2009 > 57 > 7 > 1226-1231
Science China Mathematics > 1997 > 40 > 10 > 1103-1109