ArchiveVolume 9, Issue 1, January 2020
Adrian Oscar Dongo Montoya
Pages: 1-8     Published Online: Jan. 6, 2020
DOI: 10.11648/j.edu.20200901.11        Views 69      Downloads 120
Ludmila Rakityanska
Pages: 9-13     Published Online: Jan. 17, 2020
DOI: 10.11648/j.edu.20200901.12        Views 53      Downloads 43
Svantje Schumann
Pages: 14-22     Published Online: Jan. 27, 2020
DOI: 10.11648/j.edu.20200901.13        Views 43      Downloads 53
Yong Hu, Qiushi Hu
Pages: 23-28     Published Online: Jan. 31, 2020
DOI: 10.11648/j.edu.20200901.14        Views 34      Downloads 46
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