@incollection{kadison75,
  AUTHOR =	 {Kadison, R. V.},
  TITLE =	 {Operator algebras},
  BOOKTITLE =	 {Algebras in analysis (Proc. Instructional Conf. and
                  NATO Advanced Study Inst., Birmingham, 1973)},
  PAGES =	 {101--117},
  PUBLISHER =	 {Academic Press},
  ADDRESS =	 {London},
  YEAR =	 1975
}

@incollection{kadison90,
  AUTHOR =	 {Kadison, Richard V.},
  TITLE =	 {Operator algebras---an overview},
  BOOKTITLE =	 {The legacy of John von Neumann (Hempstead, NY,
                  1988)},
  VOLUME =	 50,
  PAGES =	 {61--89},
  PUBLISHER =	 {Amer. Math. Soc.},
  ADDRESS =	 {Providence, RI},
  YEAR =	 1990
}

@article{roberts68,
  AUTHOR =	 {Roberts, J. E. and Roepstorff, G.},
  TITLE =	 {Some basic concepts of algebraic quantum theory},
  JOURNAL =	 {Comm. Math. Phys.},
  VOLUME =	 11,
  YEAR =	 {1968/1969},
  PAGES =	 {321--338}
}