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  1. 1 2 Plesha, Gray, and Costanzo (2010). Engineering Mechanics - Statics. McGraw-Hill. tr. 8-9.Quản lý CS1: nhiều tên: danh sách tác giả (liên kết)
  2. ↑ Lieb, E. H. (1991). The stability of matter. In The Stability of Matter: From Atoms to Stars (pp. 483-499). Springer, Berlin, Heidelberg
  3. ↑ Chen, Z., Khajeh, A., Martini, A., & Kim, S. H. (2019). Chemical and physical origins of friction on surfaces with atomic steps. Science advances, 5(8), eaaw0513.