Witkowska, D., and K. Kompa. “PRICES OF PAINTINGS ON POLISH ART MARKET IN YEARS 2007-2010 : HEDONIC PRICE INDEX APPLICATION”. Acta Scientiarum Polonorum. Oeconomia, vol. 13, no. 3, Sept. 2014, pp. 127-41, https://aspe.sggw.edu.pl/article/view/490.