2014GOST 13047.10-2014 Nickel. Cobalt. Methods for determination of copper
2002GOST 13047.10-2002 Nickel. Cobalt. Methods for determination of copper
1981GOST 13047.7-1981 Nickel. Methods for the determination of copper
0000 GOST 13047.7-1967
GOST 13047.7-1981 Nickel. Methods for the determination of copper was changed to GOST 13047.10-2002 Nickel. Cobalt. Methods for determination of copper.