1. J. Czochralski and E. Rassow; see also J. Czochralski, “Moderne Metallkunde”, Springer-Verlag OHG, Berlin, p 36 (1924).
2. P. Assmann,Z. Metallkunde, 18, p 51–52 (1926).
3. A. Müller,Z. Metallkunde, 18, p 231–232 (1926).
4. G. Grube, L. Mohr and W. Breuning,Z. Elektrochem., 41, p 880–883 (1935).
5. F.I. Shamray and P.Ya. Saldau,Izv. Akad. Nauk SSSR Otd. Khim. Nauk, p 631–640 (1937).