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Gmelin Handbook: B: B-Verb.1, 3.6.1.1, page 267 - 271
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American Potash & Chemical Corp.
Patent: US3288726 , 1966 ;
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Gmelin Handbook: B: B-Verb.4, 4.4.2.3.2, page 124 - 126

Aubrey, D. W.; Lappert, M. F. Journal of the Chemical Society, 1959 , p. 2927 - 2931           Gmelin Handbook:  B: B-Verb.4,  13.3.2, page 329 - 333