On Schatten-von Neumann class properties of pseudo-differential   operators. The Cordes-Kato method
  We investigate the Schatten-class properties of pseudo-differential operators with the (revisted) method of Cordes and Kato. As symbol classes we use classes similar to those of Cordes in which the $L^{\infty}$% -conditions are replaced by $L^{p}$-conditions, $1\leq p<\infty $. 
Gruia Arsu