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edu-3338	orcid.org	https://orcid.org/0000-0002-9004-3666
edu-3338	doi.org	https://doi.org/10.24197/ogigia.24.2018.19-42
edu-3338	doi.org	https://doi.org/10.1016/j.jslw.2011.12.002
edu-3338	doi.org	https://doi.org/10.29252/ijree.2.4.51
edu-3338	doi.org	https://doi.org/10.24093/awej/vol10no3.26
edu-3338	doi.org	https://doi.org/10.7575/aiac.ijalel.v.7n.6p.86
edu-3338	doi.org	https://doi.org/10.1093/applin/4.2.126
edu-3338	doi.org	https://doi.org/10.1016/j.jslw.2019.04.003
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edu-3338	doi.org	https://doi.org/10.5539/ies.v8n3p122
edu-3338	doi.org	https://doi.org/10.37546/jalttlt35.3-1
edu-3338	doi.org	https://doi.org/10.1016/j.compcom.2019.102524
edu-3338	doi.org	https://doi.org/10.1016/j.sbspro.2013.08.511
edu-3338	www.teslej.org	http://www.teslej.org/wordpress/issues/volume14/ej55/ej55m1/
edu-3338	doi.org	https://doi.org/10.5539/elt.v10n3p101
edu-3338	doi.org	https://doi.org/10.5539/elt.v10n3p101
edu-3338	doi.org	https://doi.org/10.1017/s0958344015000099
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edu-3338	www.scipress.com	http://www.scipress.com/ilshs.11.47
edu-3338	www.teslej.org	http://www.teslej.org/wordpress/issues/volume14/ej55/ej55m1
edu-3338	doi.org	https://doi.org/10.28945/3870
edu-3338	doi.org	https://doi.org/10.4304/jltr.5.6.1256-1262
edu-3338	doi.org	https://doi.org/10.2307/3586792
edu-3338	doi.org	https://doi.org/10.1016/j.system.2018.04.009