Ni, Xin Long, Zeng, Xi, Redshaw, Carl, Yamato, Takehiko, "Ratiometric fluorescent receptors for both Zn 2+ and H 2PO 4- ions based on a pyrenyl-linked triazole-modified homooxacalix[3]arene: A potential molecular traffic signal with an R-S latch logic circuit", Journal of Organic Chemistry, 2011