南京林业大学学报（自然科学版）
THE CALCULATION OF NATURAL FREQUENCIES OF ELASTIC SIMPLY SUPPORTED BEAMS WITH CONCENTRATED MASS
Shen Guanfu
JOURNAL OF NANJING FORESTRY UNIVERSITY . 1991, (03): 54 -59 .  DOI: 10.3969/j.jssn.1000-2006.1991.03.011

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