2014GOST 13047.4-2014 Nickel. Cobalt. Methods for determination of cobalt in nickel
2002GOST 13047.4-2002 Nickel. Cobalt. Methods for determination of cobalt in nickel
1981GOST 13047.6-1981 Nickel. Methods for the determination of cobalt
0000 GOST 13047.6-1967
GOST 13047.6-1981 Nickel. Methods for the determination of cobalt was changed to GOST 13047.4-2002 Nickel. Cobalt. Methods for determination of cobalt in nickel.