2Dupagne,M.Beyond the principle of relative constancy:determinants of consumer mass media expenditures in Belgium[].The Journal of Media Economics.1997
3Tillinghast,W.A.Declining Newspaper Readership: Impact of Region and Urbanization[].Journalism Quarterly.1981
4McCombs,M.E.Mass media in the market- place[].Journalism Monographs.1972
5Demers,D.P.Relative constancy hypothesis, structural pluralism,and national advertising expen- ditures[].The Journal of Media Economics.1994
6Wurff,R,Bakker,P,Picard,R.G.Eco- nomic Growth and Advertising Expenditures in Dif- ferent Media in Different Countries[].Journal of Me- dia Economics.2008
