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In: Econtechmod. -- ISSN 2084-5715. -- Vol. 5, no. 3 (2016), s. 171-176, online
Kategória EPCA do 2021: ADE
http://yadda.icm.edu.pl/baztech/element/bwmeta1.element.baztech-def03adc-420f-4868-89f4-a8d62b39bc15/c/Tkach._EN.pdf .