Gajos, E., and K. Prandecki. “NATIONAL ACCOUNTING MATRIX WITH ENVIRONMENTAL ACCOUNTS (NAMEA) - AN OVERVIEW OF ENVIRONMETALLY EXTENDED INPUT-OUTPUT ANALYSIS”. Acta Scientiarum Polonorum. Oeconomia, vol. 15, no. 4, Dec. 2016, pp. 65-74, https://aspe.sggw.edu.pl/article/view/363.