Mousavi Zadeh, Seyedeh Maryam, Hakkak, Mohammad, Arefnezhad, Mohsen. Developing a Model and Identifying the Factors Influencing  the Emergence of Black Holes in Human Resources in order to Improve the Productivity of Companies using Fuzzy Cognitive Map. The Journal of Productivity Management. 2024;18(69):139-174. doi:10.83050/jpm.2024.11258602