Jaggi, S. and Gupta, U. 2013. Solid phase extraction and preconcentration of Ni(II) using 1-(2-pyridylazo)-2-naphthol) (PAN) modified β-cyclodextrin butanediol diglycidyl ether polymer as a solid phase extractant. Macedonian Journal of Chemistry and Chemical Engineering. 32, 1 (Jun. 2013), 57–67. DOI:https://doi.org/10.20450/mjcce.2013.86.