%0 Journal Article %T SD-STEAM theory of collective excitations and the validity of the model of interacting bosons %A K. Baktybayev %A A. Dalelkhankyzy %A M. K. Baktybayev %J Advanced Studies in Theoretical Physics %D 2012 %I %U http://www.m-hikari.com/astp/astp2012/astp25-28-2012/dalelkhankyzyASTP25-28-2012.pdf