Kaewvilai, Attaphon, Thitiporn Rungsimanon, Nattamon Koonsaeng, Suwabun Chirachanchai, and Apirat Laobuthee. 2010. “Branching Structures of Alkali Metal Ion Responsive Supramolecules Based on Symmetric Structures of N,N-Bis(5-Alkyl-2-hydroxybenzyl)methylamine”. Asian Journal of Chemistry 22 (10):7628-40. https://asianpubs.org/index.php/ajchem/article/view/12080.