Ghasemi, Maasoomeh, Moghimi, Ali, Karimi, Mohammad-Ali, Mozaffari, Shahla. “Solid-phase Extraction Using Modified Carbon Nanotube and Cupferron Ligand for Preconcentration and Determination of Trace Amounts of Copper in Real Samples.” Journal of Applied Chemical Research, vol. 12, no. 3, 2018, pp. 22-30.