Reduction of basic initial-boundary value problems for the Stokes equations to initial-boundary value problems for parabolic systems of pseudodifferential equations
Zapiski Nauchnykh Seminarov POMI, Boundary-value problems of mathematical physics and related problems of function theory. Part 19, Tome 163 (1987), pp. 37-48

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It is shown that the initial-boundary value problems for the Stokes equations with the prescription of velocities $\vec{v}$, stresses, or of the normal component of velocity and tangential stresses on the boundary can be reduced to initial-boundary value problems for systems $\vec{v}_t+A\vec{v}=\vec{f}$ where $A$ is a linear operator containing a npa-local term (the so called singular Green operator). For solutions; of these problems coercive estimates in the sobolev space» $W_2^{\ell,\ell/2}$ and the estimate, of the norm of the resolving operator in $W_2^r$ are given.
@article{ZNSL_1987_163_a3,
     author = {Gerd Grubb and V. A. Solonnikov},
     title = {Reduction of basic initial-boundary value problems for the {Stokes} equations to initial-boundary value problems for parabolic systems of pseudodifferential equations},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {37--48},
     publisher = {mathdoc},
     volume = {163},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1987_163_a3/}
}
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Gerd Grubb; V. A. Solonnikov. Reduction of basic initial-boundary value problems for the Stokes equations to initial-boundary value problems for parabolic systems of pseudodifferential equations. Zapiski Nauchnykh Seminarov POMI, Boundary-value problems of mathematical physics and related problems of function theory. Part 19, Tome 163 (1987), pp. 37-48. http://geodesic.mathdoc.fr/item/ZNSL_1987_163_a3/