Palmquist, Helena; Hanæus, Jörgen (2004). „A Swedish overview of selecting hazardous substances as pollution indicators in wastewater”. Management of Environmental Quality: An International Journal. 15 (2): 186—203. Bibcode:2004MEnvQ..15..186P. doi:10.1108/14777830410523116.
Palmquist, Helena; Hanæus, Jörgen (2004). „A Swedish overview of selecting hazardous substances as pollution indicators in wastewater”. Management of Environmental Quality: An International Journal. 15 (2): 186—203. Bibcode:2004MEnvQ..15..186P. doi:10.1108/14777830410523116.
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Palmquist, Helena; Hanæus, Jörgen (2004). „A Swedish overview of selecting hazardous substances as pollution indicators in wastewater”. Management of Environmental Quality: An International Journal. 15 (2): 186—203. Bibcode:2004MEnvQ..15..186P. doi:10.1108/14777830410523116.
Palmquist, Helena; Hanæus, Jörgen (2004). „A Swedish overview of selecting hazardous substances as pollution indicators in wastewater”. Management of Environmental Quality: An International Journal. 15 (2): 186—203. Bibcode:2004MEnvQ..15..186P. doi:10.1108/14777830410523116.