Stone spectra of finite von Neumann algebras of type $\rm{I}_{n}$
  \noindent{In} this paper, we clarify the structure of the Stone spectrum of an arbitrary finite von Neumann algebra $\rr$ of type $\rm{I}_{n}$. The main tool for this investigation is a generalized notion of rank for projections in von Neumann algebras of this type. 
Hans F. de Groote