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cepi, special recycling 2004 statistics, blz. 5, beschikbaar op: http://www.cepi.org/docshare/docs/2/clglimndgchlpdbbpmcpojaaydsnv9vnwkbwbk33pdbn/cepi/docs/dls/recstats140804a-2006-00021-01-e.pdf
cepi, special recycling 2004 statistics (zvláštní statistiky o recyklaci za rok 2004), s. 5, dostupné na adrese http://www.cepi.org/files/sp%20rec%202005-135002a.pdf