1. James Riccati: Verae, et germanae virium elasticarum leges ex phaenomenis demonstratae. De Bonononiensi sei. art. inst. acad. comm. 1, 523–544 = Opera 3, 239-257. (See Truesdell [1960, 1], p. 115.)
2. Jordan Riccati: Delle vibrazioni sonore dei cilindri. Mem. mat. fis. soc. Italiana 1, 444–525 (1782) (or see Truesdell [1960, 1], pp. 328-329).
3. Förster and Köster [1937, 2].
4. E. Grüneisen: Ann. Physik (4) 25, 825 (1908).
5. O. Bender: Ann. Physik (5) 34, 359 (1939); the values are for —190° and are (Na, K) calculated from single crystal data.