Regularity of solutions for some problems of mathematical physics A. Koshelev — 1995 Annales de l'I.H.P. Analyse non linéaire
Regular solutions of the Navier-Stokes system. Chelkak, S.; Koshelev, A.; Oganesyan, L. — 1997 Memoirs on Differential Equations and Mathematical Physics
On regularity of solutions to some problems of mathematical physics Koshelev, A. I.; Chelkak, S. I.; Chistyakov, V. M. — 1990 Equadiff 7