1. E.H. Chia, private communication with Ludvigsson.
2. A.J. Phillips, “Gas and Other Impurity Reactions in Copper,” Metallurgical Transactions, Vol. 4, 1973, pp. 1935–1943.
3. E.H. Chia, Master’s Thesis “Gas Equilibrium in Copper,” Georgia Institute of Technology, June, 1967.
4. Y.Y. Su, “Analysis of the Factors Affecting the Drawability of Copper Rods,” Wire Journal International, Jan. 1982, pp. 35–43.
5. M. Leisch and K.D. Rendulic, “A Mass Spectrometric Investigation of the Incorporation of Organic Matter into Electrodeposits,” Z. Metallkde., Vol. 75, 1984, pp. 459–462.