1. 1. Pradyot, P. (2002) Inorganic compounds. Handbook of inorganic chemicals. https://fitk.iainambon.ac.id/tadrisipa/wp-content/uploads/sites/6/2020/10/handbook-of-inorganic-chmemical.pdf
2. Impurity effects in high-conductivity copper. J. of Minerals;Hsu;Metals and Materials,1977
3. 3. Devis, J.R. (2001) Copper and copper alloys: ASM Specialty Handbook.
4. 4. Chapman, D. (2011) High conductivity copper for electrical engineering. https://leonardo-energy.pl/wp-content/uploads/2019/03/mied%c5%b9-elektryka-raport.pdf
5. 5. Movchan, B.A., Tikhonovsky, A.L., Kudinov, Yu.A. (1973) Electron beam melting and refining of metals and alloys. Kyiv, Naukova Dumka [in Russian].