## https://www.amazon.com/Low-energy-Excitations-Disordered-Solids-Structural/dp/9811217246
[Low-Energy Excitations in Disordered Solids : A Story of the 'Universal' Phenomena](https://www.worldscientific.com/doi/pdf/10.1142/9789811217258_0001)
[to view](https://books.google.ru/books?id=630xEAAAQBAJ&pg=PA351&lpg=PA351&dq=collective+energy++relaxation+amorphous+solids&source=bl&ots=1JHbHYsIeU&sig=ACfU3U2ASVQoDAkqrmqL2a_51f-TT7AgRQ&hl=ru&sa=X&ved=2ahUKEwjqo8ukiPzzAhVkl4sKHavHBhAQ6AF6BAgfEAM#v=onepage&q=collective%20energy%20%20relaxation%20amorphous%20solids&f=false)
## [Glassy Disordered Systems: Glass Formation and Universal Anomalous Low ... - By Michael I. Klinger](https://books.google.co.uk/books?hl=en&lr=&id=u3u6CgAAQBAJ&oi=fnd&pg=PR5&ots=u390ISl_6R&sig=A_QVZHN8jfqrfyXdTK5ny8561YM&redir_esc=y#v=onepage&q&f=false)
