R. Kisiel, K. Babuchowska, R. Marks-Bielska, and M. Wojarska, “Analysis of Strengths and Weaknesses of Business Environment Institutions from Warmia-Masurian Voivodeship as Well as Opportunities and Threats for Their Operations”, EQUIL, vol. 6, no. 1, pp. 109–124, Mar. 2011.