@article{19712710, title={The Chelating Behavior of 1-(2-Phosphonophenylazo)-2-hydroxynaphthalene-3,6-disulfonic Acid with Alkaline Earth Metals}, author={Kenyu Kina and Haruo Miyata and Kyoji Tôei}, journal={Bulletin of the Chemical Society of Japan}, volume={44}, number={10}, pages={2710-2712}, year={1971}, doi={10.1246/bcsj.44.2710} }