GOST R 50779.71-1999 Statistical methods. Sampling procedures for inspection by attributes. Part 1. Sampling plans indexed by acceptable quality level (AQL) for lot-by-lot inspection*, 1999-04-19 Update
ISO 1573:1980 Tea; Determination of loss in mass at 103 degrees C
ISO 3103:1980 Tea; Preparation of liquor for use in sensory tests