1. N. F. Batygin, Ontogenesis of Higher Plants (Agropromizdat, Moscow, 1986).
2. OST 56-94-88. Seeds of Tree Species. X-Ray Analysis Methods (1988).
3. ISO 1162-75. Cereals and Pulses. Method of Test for Infestation by X-Ray Examination (1980).
4. GOST 28666.4-90 (ISO 6639/4-87) Cereals and Pulses. Determination of Hidden Insect Infestation. Part 4. Rapid Methods (1991).
5. Seed Examination Procedure (Moscow, 1995).