Chatterjee, Sudipta. Tribological Properties of Pseudo-Elastic Nickel-Titanium (en anglès). BiblioBazaar, 2011-09, p. 11-12. ISBN 978-1-243-55263-1. «Classical Greek philosophers like Aristotle, Pliny the Elder and Vitruvius wrote about the existence of friction, the effect of lubricants and the advantages of metal bearings around 350 B.C.»
Fishbane, Paul M.; Gasiorowicz, Stephen; Thornton, Stephen T. Physics for Scientists and Engineers (en anglès). I. Extended. Englewood Cliffs, New Jersey: Prentice Hall, 1993, p. 135. ISBN 978-0-13-663246-7. «Themistius first stated around 350 A.D. that kinetic friction is weaker than the maximum value of static friction.»