Every reference with a DOI in the deposited reference list resolved to a known
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The spatial epidemiology of cocaine, methamphetamine and 3,4‐methylenedioxymethamphetamine (MDMA) use: a demonstration using a population measure of community drug load derived from municipal wastewater
Five-year monitoring of 19 illicit and legal substances of abuse at the inlet of a wastewater treatment plant in Barcelona (NE Spain) and estimation of drug consumption patterns and trends
Population surveys compared with wastewater analysis for monitoring illicit drug consumption in Italy in 2010–2014
The 5 references without a DOI — listed, not checked
no DOI — not checkedNNCC (2014) Annual report on drug abuse National Narcotics Control Commission http://www.nncc626.com/2015-06/24/c_127945747.htm
no DOI — not checkedNNCC (2016) Annual report on drug abuse National Narcotics Control Commission http://www.nncc626.com/2017-03/27/c_129519255.htm
no DOI — not checkedNNCC (2017) Annual report on drug abuse National Narcotics Control Commission http://www.nncc626.com/2018-06/25/c_129900461.htm
no DOI — not checkedNNCC (2018) Annual report on drug abuse National Narcotics Control Commission http://www.nncc626.com/2019-06/17/c_1210161797.htm
no DOI — not checkedUNODC (2016) World drug report 2016 vol United Nations Office on Drugs and Crime. http://www.unodc.org/wdr2016/
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