  The mixed boundary value problem for a compressible Stokes system of partial
differential equations in a bounded domain is reduced to two different systems
of segregated direct Boundary Integral Equations (BDIEs) expressed in terms of
surface and volume parametrix-based potential type operators. Equivalence of
the BDIE systems to the mixed BVP and invertibility of the matrix operators
associated with the BDIE systems are proved in appropriate Sobolev spaces.
