For citations:
, , . South of Russia: ecology, development. 2009;4(3):146-150. (In Russ.) https://doi.org/10.18470/1992-1098-2009-3-146-150
, , . South of Russia: ecology, development. 2009;4(3):146-150. (In Russ.) https://doi.org/10.18470/1992-1098-2009-3-146-150