东北杨（Populus girinensis Skv.）为落叶乔木，高12米，胸径约45厘米；树冠长卵形；树皮有沟裂；小枝圆棒状，微有短柔毛。花期4，果期5月。
张庆灵，杨冬梅，不确定广义系统的分析与综合（校庆专著），东北大学出版社，2003。
Qingling Zhang, Dongmei Yang, Analysis and Control for Uncertain Descriptor Systems, Northeastern University Press, Shenyang, 2003.
张学良在完成东北易帜后，在内政方面做的第一件大事是枪杀杨宇霆和常荫槐。
Chang took over the ruling in Northeast China in 1928, the first important thing he did was killing Yang Yuting and Chang Yinhuai.
杨振成总经理1985年毕业于东北电力学院热能工程专业、高级工程师。
Yang Zhencheng, senior engineer, has been working on hydro - and thermal power technology since graduation from Northeast Dianli College majoring in thermal engineering in 1985.
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