prov:value
| - he more liquid peripheral lens substance, this material is first dissolved in aqueous solutions of suitable dissolving agents such as acids, for instance, pyruvic acid, lactic acid, tartaric acid, citric acid, and the like hydroxy carboxylic acids, or alkaline agents, for instance, lithium hydroxide, sodium hydroxide, potassium hydroxide, ammonia, urea, thiourea, and their alkyl derivatives, and t
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