1. A. I. Popov, Farmatsiya, No. 1, 51 – 53 (1993).
2. A. I. Popov, Khim.-farm. Zh., No. 11, 50 – 52 (1993).
3. A. I. Popov, Vopr. Pitan., No. 1, 38 – 39 (1994).
4. C. H. Hill and G. Matrone, Fed. Proc., 4, 1474 – 1481 (1970).
5. J. Li and S. M. Assmann, Plant Physiol., 123, 807 – 809 (2000).