2014GOST 13047.9-2014 Nickel. Cobalt. Method for determination of phosphorus
2002GOST 13047.9-2002 Nickel. Cobalt. Method for determination of phosphorus
1980GOST 741.8-1980 Cobalt. Method for the determination of phosphorus
0000 GOST 741.8-1969
GOST 741.8-1980 Cobalt. Method for the determination of phosphorus was changed to GOST 13047.9-2002 Nickel. Cobalt. Method for determination of phosphorus.