ECO SAPIENS - экологическое сознание человека XXI века в науке, образовании и обществе.
Российский университет дружбы народов (РУДН).
2019.
С. 142-146
Accredited testing laboratories are required to prove their competence one year after receiving accreditation. Then, every 2 years, the verification procedure of the Federal Accreditation is repeated.