Citation

Moxon NT , Fielding PE Gregson AK (1981) The characterization of copper 4,4',4'',4'''-Tetrasulfonated phthalocyanine ([29H, 31H-phthalocyanine-2,9,16,23-tetrasulfonato(2-)-N²⁹, N³⁰, N³¹,N³²]copper) and the α-form of copper phthalocyanine ([29H,31H-phthalocyaninato(2-)-N²⁹, N³⁰, N³¹, N³²]copper). Australian Journal of Chemistry 34, 489-494.

https://doi.org/10.1071/CH9810489