| http://www.w3.org/ns/prov#value | - Suitable calcium sources include calcium carbonate, calcium oxide, calcium hydroxide, calcium halide, e.g. calcium fluoride, and the like, as well as calcium phosphates, such as tetracalcium phosphate, tricalcium phosphate, dicalcium phosphate and its dihydrate, monocalcium phosphate and its monohydrate, and the like, where such additional calcium sources may act as bases, acids, sources of counte
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