1. Crane, F. L.: Bole of trace elements in electron transport and oxidative phosphorylation. — Soil Sci. 85: 78–86. 1958.
2. Mashkova, N. P., Severin, S, E.: [Textbook of animal physiology methods.] In Russ. — Publish. House “Sovetskaya Nauka”, Moscow 1950.
3. Molotkovskiy, Yu. G.: [Plant metabolism characteristics in relation to resistance of plants to high temperatures.] In Russ. — Izvest. Akad. Nauk SSSR, Ser. biol. 2: 246–249 1961.
4. Natanson, N. E.: [Influence of some microelements on plasma viscosity of plants.] In Russ. — Dokl. Akad. Nauk SSSR 87: 1067–1070, 1952.
5. Novitskaya, Yu. E.: [Significance of pre-sowing hardening in solutions of some microelements for drought resistance of plants.] In Russ. — Trudy BIN, Ser. IV — Eksper. Bot. 12: 74–94, 1958.