The claim that substances other than water are less dense as solids than as liquids is a fundamental statement about thermodynamics and phase behavior for which no citation is needed.
Water is less dense as a solid than as a liquid, while most other substances are denser as solids than as liquids.
The user presents a factual statement regarding the density anomalies and phase behaviors of various substances. None of the provided papers directly test or focus on this general physical chemistry principle; the papers are about unrelated topics like thermoelectrics, melting theory models, DNA binding proteins, and air pollution. Therefore, no papers can be validly assigned to support or refute the claim, and it falls under common knowledge of physical states.