In some aulder beuks, the term haes been uised synonymously wi glass. Nowadays, "amorphous solit" is considered tae be the owerarchin concept, an glass the mair special case: A glass is an amorphous solit that exhibits a glass transeetion.
- J. Zarzycki: Les verres et l'état vitreux. Paris: Masson 1982. English translation available.