DORČÁK, Peter - MARKOVIČ, Peter - POLLÁK, František - SVETOZAROVOVÁ, Nella. Key Performance Indicators in the Process of Performance Evaluation Selected Approaches. In International Journal of System Modeling and Simulation : peer reviewed international open access journal IJSMS. - Dubai : Research Plus Journals, 2017. ISSN 2518-0959, 2017, vol. 2, no. 4, pp. 17-20 online.