ArchiveVolume 4, Issue 4, December 2019
Redwan Gabr El-Sobky
Pages: 83-92     Published Online: Dec. 16, 2019
DOI: 10.11648/j.ellc.20190404.11        Views 354      Downloads 113
Antipenko Leonid Grigoryevich
Pages: 93-98     Published Online: Dec. 24, 2019
DOI: 10.11648/j.ellc.20190404.12        Views 305      Downloads 126
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