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US patent 614350, Seyene, H.; Cahen, E. D., "Match Composition", issued 1898-11-15
Burns, Gary R.; Sarfati, Jonathan D. (1988). "Raman spectra of tetraphosphorus triselenide doped in tetraphosphorus trisulphide". Solid State Communications. 66 (4): 347–349. Bibcode:1988SSCom..66..347B. doi:10.1016/0038-1098(88)90854-X.