1G a r n e r C A .C o m m o d it y P r ic e s : P o lic y T a r g e t o rIn fo rm atio n V ariable-: N o te [J].Jo u rn a l o f M o n e y ,C re d itan d B an k in g,1989,21(4): 508-514.
5R u a A ,N u n es L C .In tern ation al C o m ov em en t o f S tockM arket R eturns. A Wavelet A n alysis[J] .Jou rnal o f Em piricalFin ance,2009,16(4): 632-639.