10Nuta Elena. Seismic analysis of steel wind turbine towers in the Canadian environment[D]. Graduate Department of Civil Engineering University of Toronto, 2010, 9-12.
7Calsyn R J,Winter J P,Burger G K. The relationship between social anxiety and social support in adoleseents:A test of competing causal models[J]. Adolescents, 2005,40(157) : 103-108.