%0 Journal Article %T FORM DIVERSITY OF <i>POPULUS NIGRA L., P. LAURIFOLIA LEDEB. </i>AND <i>P. × JRTYSCHENSIS </i>CHANG Y. YANG IN THE NORTH-WESTERN PART OF THE ALTAI-SAYANIAN MOUNTAIN AREA %A Klimov, A.V. %A Proshkin, B.V. %K %J Bulletin of Kemerovo State University. Series: Biological, Engineering and Earth Sciences %D 2017 %N 1 %P 5 %I Kemerovo State University