Grubb, Gerd, and Vsevolod A. Solonnikov. “Boundary Value Problems for the Nonstationary Navier-Stokes Equations Treated by Pseudo-Differential Methods”. Mathematica Scandinavica 69 (December 1, 1991): 217–290. Accessed July 25, 2026. https://journals.msp.org/mscand/article/view/1294.