Silicon-containing compounds in horsetail (Equisetum Equisetaceae) composition - Lyudmila A. Zemnukhova*,**, Olga D. Arefieva*,**, Anna V. Kovekhova*,**, Natal'ya V. Polyakova*, Aleksandr E. Panasenko*,**, Antonina Yu. Kamaeva (Известия вузов: Прикладная химия и биотехнология)