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American Journal of Applied Mathematics and Statistics, 2017, Vol. 5, No. 3, 90-94 Available online at http://pubs.sciepub.com/ajams/5/3/1 ©Science and Education Publishing DOI:10.12691/ajams-5-3-1
Applied Mathematics 2019, 9(1): 1-5 DOI: 10.5923/j.am.20190901.01
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