Mineral fertilizers. Method for determination of total mass fraction of nitrogen in single - component fertilizers (in ammonium and amide forms, no deammoniation)
Safety of household and similar electrical appliances. Part 2-55. Particular requirements for electrical appliances for use with aquariums and garden ponds
Microbiology of food and feeding stuffs. Preparation of samples for testing, original suspension and tenfold dilutions for microbiological research. Part 1. General rules for preparing the initial suspension and tenfold dilutions
