8BORKOWSKA-BURNECKA J. Microwave assisted extraction for trace element analysis of plant materials by ICP-AES[J].Fresenius Journal of Analytical Chemistry, 2000,368 (6): 633-637.
9LESNIEWICZ A, ZYRNICKI W. Extraction of trace elements from spruce needles[J]. Communieations in Soil Science and Plant Analysis, 2003,34 (5/6): 629-643.
