Marks-Bielska, R., W. Lizińska, K. Babuchowska, and M. Wojarska. “Factors Determining the Institutional Efficiency of Self-Governments in the Economic and Spatial Area”. Regional Barometer. Analyses & Prognoses, vol. 15, no. 1, May 2017, pp. 67-75, doi:10.56583/br.451.