Chekhla, Serhii. “THE PLACE OF THE PORTFOLIO OF PROJECTS AND PROGRAMS IN THE STRATEGIC MANAGEMENT SYSTEM: A COMPARATIVE ANALYSIS OF THE PMI, PRINCE2 (MOP), SAFE AND BALANCED SCORECARD APPROACHES”. European Journal of Interdisciplinary Issues, vol. 2, no. 3, Oct. 2025, pp. 115-26, doi:10.5281/zenodo.19037873.