| http://www.w3.org/ns/prov#value | - Almdale et al. (Polymer Gels and Networks, Vol. 1, No. 5 (1993)) list two criteria for defining a system as a gel: (1) a gel consists of two or more components, one of which is a liquid, present in substantial quantities; and (2) a gel is a soft material which is solid or solid-like.
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