Du, Q. et al. 2015. Spectrofluorimetric Study on Inclusion Behaviour of p-Sulfonated Calix[4,6]arene with 1,10-Phenanthroline. Asian Journal of Chemistry. 27, 7 (Mar. 2015), 2431–2436. DOI:https://doi.org/10.14233/ajchem.2015.17897.