2014GOST 13047.8-2014 Nickel. Cobalt. Method for determination of silicon
2002GOST 13047.8-2002 Nickel. Cobalt. Method for determination of silicon
1981GOST 13047.4-1981 Nickel. Methods for the determination of silicon
0000 GOST 13047.4-1967
GOST 13047.4-1981 Nickel. Methods for the determination of silicon was changed to GOST 13047.8-2002 Nickel. Cobalt. Method for determination of silicon.