O. V. Zhytkevych , N. M. Chaplynska, D. G. Cardenas. (2022) Mathematical method for evaluation of e- learning competitiveness of educational companies. Baltic Journal of Economic Studies. 8(2):153-161. (ENG)

O. V. Zhytkevych , N. M. Chaplynska(2022). Formalization the assessment process of the COVID-19 impact on the competitive markets and economies. Economics and Law. 1: 120- 128.(ENG)

Zhytkevych O.V. (2021) Development of principles for construction of a rational method for formalization the assessment process of the negative impact of the environmental problem on the competitive market. Technology audit and production reserves.4(60):19- 23. (ENG)

Zhytkevych O.V. (2015) Management of competitiveness of domestic enterprises as the basic lever of economic development in innovation. Socio-economic problems of management:[collective monograph]. Millburn: Thorpe-Bowker®, 189-198(UKR)

Zhytkevych O.V. (2015) Building complex target programs to improve the competitiveness of domestic enterprises. Business Inform (4):99 – 104 (UKR)

Zhytkevych O.V. (2015) Analysis of existing software tools for evaluating the competitiveness of Ukrainian enterprises. The young scientist (5):145-148. (UKR)

Zhytkevych O.V. (2013) Mathematical and structural evaluation models of the competitiveness of domestic enterprises. Economics and Entrepreneurship, 8(37): 283- 286 (RUS)

Zhytkevych O.V. (2013) Mathematical methods of estimation, based on fuzzy logic, the quantitative and qualitative parameters of identifying the competitiveness level of domestic enterprises. Economics and Entrepreneurship, 10(39): 324-327 (RUS)