Krespan,C.G.
Journal of the American Chemical Society, 1961 , vol. 83, p. 3434 - 3437
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Gmelin Handbook: F: PerFHalOrg.1, 1.1.5.2, page 57 - 85
in neat (no solvent) mixt. of K2S, P2S5, S and In was sealed in quartz tube in vac.; heated at 550°C for 24 h; kept at 550°C for 3 d; cooled to 250°C (5 K/h) and to 50°C (10 K/h); washed and sonicated in DMF; decanted; washed (Et2O); dried in N2;