Symmetries of zero dynamics of nonlinear systems
sun wen an 1; zhao jun 2 1.computing center; dalian university; dalian 116622; china; 2.school of information science; northeastern university; shenyang 110006; china
Positive analysis on semistrong-form efficiency of Shanghai stock market
liu kun 1; li kai 2; zhang yong ping 3 1.benxi institute of iron and stell technology; benxi 117000; china; 2.school of business administration; northeast vniversity; shenyang 110005; china; 3.industrial and commercial bank of benxi; benxi 117000; chin