For citations:
Kuanova A.S., Ershova T.S., Zaitsev V.F., Chaplygin V.A., Litvinova N.V. The content of chemical elements in Trаpa nаtans and Nymphoides peltata of the Volga Delta. South of Russia: ecology, development. 2023;18(4):192-196. (In Russ.) https://doi.org/10.18470/1992-1098-2023-4-192-196