Konstantinova, S. Concentration and efficiency in times of crisis. Sofia: 2021 237-243,.
Konstantinova, S. Concentration and efficiency in times of crisis. Sofia: 2021 237-243,.
Konstantinova, S. (2021) Concentration and efficiency in times of crisis, Sofia: 237-243,.
Konstantinova, S. (2021). Concentration and efficiency in times of crisis. Industrial Growth Conference 2020 : Conference Proceedings Book, II-IV Oct. MMXX, Hotel Sol Nessebar Palace (с. 237-243). Sofia:.
Konstantinova S. Concentration and efficiency in times of crisis. Sofia: 2021. p. 237-243.