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Acta Innovations > 2019 > no. 33 > 100--110
Environmental & Socio-economic Studies > 2015 > 3 > 3 > 22-28
Scientific and Technical Information Processing > 2009 > 36 > 2 > 85-89
Acta Innovations > 2019 > no. 33 > 100--110
Environmental & Socio-economic Studies > 2015 > 3 > 3 > 22-28
Scientific and Technical Information Processing > 2009 > 36 > 2 > 85-89