W. van der (1998), Asymptotic statistics, Cambridge series in statistical and probabili...
Vaart,A.W.vander(1998),Asymptoticstatistics,Cambridgeseriesinstatisticalandprobabilisticmathematics,Cambridge,UK ;NewYork,NY,USA:CambridgeUniversityPress.Exercise18.6Itsufficetoprovefor.Forany,letLet.