TY JOUR TI Changes in the leaf structure and pigment complex of <i>Betula pendula</i> under conditions of technogenic air pollution KW JO Bulletin of Nizhnevartovsk State University AU Berentseva, S.. AU Borisova, G.. AU Sobenin, A.. AU Maleva, M.. PY 2024 IS PB Nizhnevartovsk State University