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# Internal friction - wide range
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- 2006 [Universal behavior of internal friction in glasses below Tg : anharmonicity vs relaxation](https://arxiv.org/pdf/cond-mat/0610693.pdf)
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**diffs between strong and fragile glasses - the relative role of defects?**
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1999 [Theory of Sound Attenuation in Glasses: The Role of Thermal Vibrations](https://epub.uni-regensburg.de/1832/1/fabian22.pdf)
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- [Internal friction universality - RevModPhys](https://knowen-production.s3.amazonaws.com/uploads/attachment/file/5377/2002%2B-%2BPohl%2B-%2Brevmodphys.74.991.pdf)
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- Internal friction plot - 1986 [Low temperature properties of glasses-unsolved problems - A K RAYCHAUDHURI](https://www.ias.ac.in/article/fulltext/jcsc/096/06/0559-0564)
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![cc](https://knowen-production.s3.amazonaws.com/uploads/attachment/file/5475/friction.png 'bb')
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## crystals vs glasses?
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# Parents
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* Small d-less coupling- $\lambda/l$ ratio - P⏎